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Envision Math 2.0: Grade 6, Volume 2 View details

2. Solve Triangle Area Problems

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Exercise 11 Page 397

Use the formula for the area of a triangle.

54cm^2

Practice makes perfect

Let's take a look at the given triangle.

Remember the formula for the area of a triangle. A=1/2bh In this formula, b is the length of the base and h is the height. For our triangle, we cam substitute b= 12 centimeters for the base and h= 9 centimeters for the height into the formula to calculate A. Let's do this!

A=1/2bh

SubstituteII

b= 12, h= 9

A=1/2( 12)( 9)

MoveRightFacToNumOne

1/b* a = a/b

A=12/2* 9

CalcQuot

Calculate quotient

A=6 * 9

Multiply

A=54

The area of the triangle is 54 square centimeters. Notice that we can also use the base that is 21.6 centimeters and its corresponding height of 5 centimeters.