Area of a Triangle Teacher Resources
Find Area of a Triangle lesson plans and worksheets
Showing 1 - 24 of 440 resources
Discovering the Formula for the Area of a Triangle
9th - 11th CCSS: Designed
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....
Alternate Formula for the Area of a Triangle: Alternate Area of a Triangle
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.
Area of a Triangle 1/2absinC
3 mins 9th - 12th CCSS: Adaptable
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...
Area of a Triangle – Sine/Trigonometry
3 mins 10th - 12th CCSS: Adaptable
New ReviewHalf 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...
What is the Formula for the Area of a Triangle Using Sines?
6 mins 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...
What is the Formula for the Area of a Triangle?
5 mins 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...