# Finding the Area of an Acute Triangle 05:34 minutes

**This Video Lesson isn't included in our free offer!**

That's why you can't watch the whole thing.

See Pricing**Learn more about our features!**

**Start Watching**

**Do the Practice Problems for this Video Lesson to test your knowledge!**

**About this Video Lesson**

## Description

After this lesson, you will be able to use and understand the area formula for an acute triangle.

The lesson begins by teaching you that an acute triangle can be decomposed into two right triangles. It leads you to learn that any acute triangle takes up half the area of a rectangle with the same base and height, which is why the formula for the area of a triangle is one half the base times the height.

Learn about the areas of triangles by designing rooftop welcome signs for the city of Polygon!

This video includes key concepts, notation, and vocabulary such as the terms “acute triangle” (a triangle containing 3 acute interior angles); “height” (a line perpendicular to the base of the triangle measuring how tall the triangle is; also called the altitude); “base” (a side of a triangle perpendicular to the height); and the notation for a 90 degree, or right, angle.

Before watching this video, you should already be familiar with how to find the area of a right triangle. You should also know that shapes can be decomposed into smaller shapes, and that rectangles are composed of two equally sized right triangles.

After watching this video, you will be prepared to learn how to determine the area of any triangle, including obtuse triangles.

Common Core Standard(s) in focus: 6.G.A.1

A video intended for math students in the 6th grade

Recommended for students who are 11 - 12 years old

### The Author

**Trentkay**

### Rate video

Be the first to rate this video!

You have to be logged in in order to rate this video.

**Finding the Area of an Acute Triangle**