Area of a Triangle Teacher Resources

Find Area of a Triangle lesson plans and worksheets
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EngageNY Grade 7 Math Module 6: Geometry

For Teachers 6th Standards
Twenty-seven lessons make up a math module designed for seventh graders to focus on the concept of geometry. Topics include angles, triangles, parallelograms, three-dimensional figures, and measurement using volume and area. Two...
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Discovering the Formula for the Area of a Triangle

For Teachers 9th - 11th Standards
Most high schoolers are very familiar with the area of the triangle being equal to 1/2 base times the height. Here, they will develop and test their formula for the area of a triangle when given two adjacent sides and the included angle....
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Alternate Formula for the Area of a Triangle: Alternate Area of a Triangle

For Students 10th - 12th
It's always nice to have a plan B. Pupils investigate an alternate formula for the area of a triangle that uses sine. A set of challenge questions shows how the new formula relates to the well-known formula of (1/2)bh.
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Area of a Triangle: Formula

For Teachers 3rd - 4th
Determine the area of a triangle using the formula 1/2L x H. The formula is shown then demonstrated on both regular and irregular triangles. There are five practice problems included.
3:50
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Area of a Triangle

For Students 6th - 8th Standards
Base times height or one half base times height ... area formulas are pretty predictable! Given the base and height dimensions of a triangle, a video lesson explains the process of finding the area. Learners have the opportunity to...
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Area of a Triangle

For Teachers 9th - 11th
In this geometry worksheet, learners solve problems by finding the area of a triangle. They are given the sides and asked to solve using the Pythagorean Theorem. There are 72 problems.
2:29
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Rearrange Formulas to Isolate Specific Variables

For Students 6th - 8th Standards
Help your students visualize the formula for the area of a triangle. They will watch Sal determine the area of a triangle using a drawing and the formula, A=1/2bh.
3:36
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Area of a Triangle - Geometry Help

For Teachers 4th - 7th
Do you know what A=1/2 bh means? If you don't this video on the area of a triangle is a must. It defines the formula needed to determine the area of a triangle, works through an example problem, and clearly explains the procedure.
3:54
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How do You Find the Area of a Triangle?

For Teachers 6th - 8th
Help your class visualize how to find the area of a triangle. In a step-by-step process, the instructor shows how to calculate the area of a triangle. Great for instruction and/or review.
3:25
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Area of a Triangle Using Trigonometry

For Teachers 9th - 12th
Step-by-step, viewers are taught how to use one angle to find the area of a triangle. This video is useful for your trigonometry learners, especially if you employ a flipped classroom model. Mathematicians can view this at home and them...
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Slope/Triangle Area Exploration

For Teachers 8th - 11th
Using CAS TI-Nspire, explore how the area of a triangle formed by the x- and y-axes and a line through a point is related to the slope of a line. Additionally, the activity serves as an introduction to rational functions and the concept...
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Triangles

For Teachers 3rd - 5th
This unit enables scholars to apply the rule for area of a triangle (area equals half base times height). They practice multiplication and division strategies as they calculate areas.
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Triangle Area

For Teachers 6th - 9th Standards
While the lesson focuses on right triangles, this activity offers a great way to practice the area of all triangles through an interactive webpage. The activity begins with the class taking a square paper and cutting in in half; can they...
2:56
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Area of a Triangle 1/2absinC

For Students 9th - 12th Standards
Can you find the area of a triangle without knowing the height? Applying trigonometry makes quick work of this type of problem. The video instructor presents problems for scholars to consider and then provides a worked out solution. She...
3:08
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Area of a Triangle – Sine/Trigonometry

For Students 10th - 12th Standards
Half the base times height was great for elementary school, but now we have a more general formula. Scholars watch a short video that highlights the area formula A = 1/2 ab sin C. The narrator works through an example of applying the...
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Algebra: Area of a Triangle - Reteach 16.4

For Students 5th - 6th
In this triangle worksheet, students read about the formula for finding the area of a triangle, then find areas for 9 triangles. Houghton Mifflin text is referenced.
11:00
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Part 1 of Proof of Heron's Formula

For Students 9th - 12th
Providing the first installment in a series devoted to the exploration of Heron's Formula, this video is a high-level experience that delves into a proof using algebra. It demonstrates a step-by-step process for finding the area of a...
1:37
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Area of a Triangle

For Students 6th - 10th
Base your calculations of the areas of triangles on their bases. An illuminating video in the Socratica Geometry playlist explains how to determine the areas of a triangle. The video uses an animation to illustrate how triangles with the...
5:32
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What is the Formula for the Area of a Triangle Using Sines?

For Teachers 8th - 11th
Watch this video to discover how trigonometry can give you another way to find area of triangle. By starting with the standard formula for the area of the triangle and the right triangle trigonometric ratio for sine, the instructor...
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Area of Triangle

For Students 3rd - 5th
In this area worksheet, students read and problem solve the area of 8 triangles. Students show their work on each problem on the worksheet.
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Formula for Finding the Area of a Triangle

For Teachers 4th
Fourth graders practice finding the area of a triangle. In this geometry lesson, 4th graders complete several mental exercises involving triangles and review finding equations for various shapes. Students then solve several word problems...
8:49
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SAT Prep: Test 2 Section 6 Part 5

For Students 9th - 12th
Addressing problems 15-16 on the practice SAT, Sal draws the diagram necessary for solving the geometry problem in number 15. After solving for the area of the triangle, he goes on to the quadratic equation in number 16, taking care to...
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Triangle in the Matrix

For Teachers 9th - 12th Standards
Young mathematicians represent a triangle with a matrix and use the determinant to find the area of three given triangles. Learners also verify the formula for area of a triangle. 
3:34
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How Do You Find the Area of a Triangle?

For Teachers 6th - 8th
The formula for the area of a triangle is: area equals one half the base times the height. If you have been given these two values then all you need to do is plug them into the formula and solve. Don't forget to write the correct ending...

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Area of a Triangle