Instructional Video3:54
Curated OER

#### 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.
Instructional Video3:25
Curated OER

#### 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...
Interactive
CK-12 Foundation

#### 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.
Instructional Video3:36
Curated OER

#### 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.
Instructional Video1:38
Socratica

#### 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...
Instructional Video5:32
Curated OER

#### 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...
Instructional Video3:50
Corbett Maths

#### 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...
Instructional Video11:00
Curated OER

#### 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...
Instructional Video8:49

#### 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...
Instructional Video3:34
Curated OER

#### 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...
Worksheet
Curated OER

#### Area of Right-Angled Triangles

For Teachers 3rd - 5th Standards
There's a trick to solving the area of a triangle, and it involves a skill your geometers have already mastered. Help them discover the connection between finding a rectangle's area and finding a right triangle's area as they solve for...
PPT
Curated OER

#### 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.
Instructional Video5:20
Curated OER

#### What is the Formula for the Area of a Triangle?

For Teachers 6th - 12th
The teacher explains how the formula for a triangle was determined. It is related to a parallelogram. What? The formula for the area of a triangle is derived from the area of a parallelogram? Seeing is believing, so watch this video to...
Instructional Video3:08
Corbett Maths

#### 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...
Lesson Plan
Shodor Education Foundation

#### 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...
Instructional Video2:57
FuseSchool

#### 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...
Lesson Plan
Curated OER

#### Finding the Area of a Triangle

For Teachers 5th
Fifth graders investigate the area of a triangle. In this geometry instructional activity, 5th graders practice finding the area of a triangle using the correct formula: 1/2bh.
Lesson Plan
Curated OER

#### 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.
Lesson Plan
Curated OER

#### Area of a Triangle

For Teachers 9th - 11th
In this geometry worksheet, students 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.
Instructional Video4:45
Curated OER

#### What is the Formula for the Area of a Triangle?

For Teachers 6th - 10th
The teacher explains how the formula for a triangle was determined. It is related to a parallelogram. What? The formula for the area of a triangle is derived from the area of a parallelogram? Seeing is believing, so watch this video to...
Lesson Plan
Curated OER

#### Perimeter and Area 5

For Teachers 6th - 8th
In this calculating area worksheet, students use their problem solving skills and the information provided to find the area of 6 triangles.
Instructional Video4:43

#### Heron's Formula

For Students 9th - 10th
Introducing Heronês formula is the main objective of this lecture. Essentially, it describes how to solve a problem. Heron's formula is given, and then a problem is solved. Since the actual explanation of the formula will be given during...
Interactive
Curated OER

#### Triangle Problems-Base, Height, and Area

For Students 10th
In this geometry worksheet, 10th graders find the base, height, or area of a triangle. The one page interactive worksheet contains ten questions. Answers and hints are included.
Worksheet
Curated OER

#### 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.