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Envision Math 2.0: Grade 7, Volume 2

EM

Envision Math 2.0: Grade 7, Volume 2 View details

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Exercise 5 Page 413

Use the formula for the area of a triangle.

27ft^2

We want to find the area of a triangle with a base of 6 feet and height of 9 feet. Let's construct a diagram of the triangle!

Now, we will use the following formula. A=1/2bh In this formula, b is the length of the base and h is the height. For our triangle, we will substitute b= 6 for the base and h= 9 for the height into the formula to calculate A.

A=1/2bh

b= 6, h= 9

A=1/2( 6)( 9)

MoveRightFacToNum

a/c* b = a* b/c

A=6/2* 9

Calculate quotient

A=3* 9

Multiply

A=27

The area of the triangle is 27ft^2.

Extra

Learn More!

If you are interested in learning more about the area and perimeter of shapes, check out the material in our original courses!

Perimeter and Area in a Coordinate Plane

Subchapter links

Review What You Know! p.413