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Big Ideas Math Geometry, 2014 View details

2. Areas of Circles and Sectors

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Exercise 42 Page 608

Use the formula for the area of a triangle.

54 in^2

Practice makes perfect

Here we will use the formula for calculating the area of a triangle. A=1/2bh Now we substitute the value of the base, b= 18, and the value of the height, h= 6, into the formula to calculate A.

A=1/2bh

SubstituteII

b= 18, h= 6

A=1/2( 18)( 6)

MoveRightFacToNum

a/c* b = a* b/c

A=18/2* 6

CalcQuot

Calculate quotient

A=9*6

Multiply

A=54