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Envision Math 2.0: Grade 6, Volume 2

EM

Envision Math 2.0: Grade 6, Volume 2 View details

2. Solve Triangle Area Problems

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Exercise 14 Page 397

Use the formula for the area of a triangle.

180in.^2

Practice makes perfect

Remember the formula for the area of a triangle. A=1/2bhIn this formula, b is the length of the base and h is the height. For our triangle, we are given that the base is 2 feet and the height is 15 inches. Because they have different units, we need to convert them to a common unit. We know that 1 feet is equal to 12 inches. 2ft=2* 12in.= 24in. The base of the triangles is 24 inches. Now, we can substitute b= 24 inches for the base and h= 15 inches for the height into the formula to calculate A. Let's do this!

A=1/2bh

b= 24, h= 15

A=1/2( 24)( 15)

MoveRightFacToNumOne

1/b* a = a/b

A=24/2* 15

Calculate quotient

A=12 * 15

Multiply

A=180

The area of the triangle is 180 square inches.

Subchapter links

Do You Understand? p.396

Do You Know How? p.396

Practice & Problem Solving p.397-398

Assessment Practice p.398