Area and Perimeter of Triangles
Grade 9•45 minutes
Learning Objective
I can calculate the area and perimeter of triangles, including using the Pythagorean theorem to find missing side lengths when necessary.
Practice Questions
This lesson includes 2 practice questions to reinforce learning.
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1. A triangle has a base of 10 cm and a height of 7 cm. Calculate the area of the triangle. If each side is doubled, what is the new area?
2. The perimeter of an equilateral triangle is 36 inches. What is the length of each side? What is the area of the triangle if the height is approximately 10.4 inches?
Educational Video
How to Find the Area and Perimeter of a Triangle | Math with Mr. J
Math with Mr. J