Exercise 18 Page 303

To find the area of the trapezoid, calculate one half the product of the height and the sum of the bases.

10cm^2

Practice makes perfect

Let's find the area of the given trapezoid. The area of a trapezoid is one half the product of the height and the sum of the bases.

In the given trapezoid, the height is 4 centimeters and the bases are 3 12 centimeters and 1 12 centimeters. We can substitute these values into the formula for the area of a trapezoid. Let's do it!

A=1/2h(b_1+b_2)

SubstituteValues

Substitute values

A=1/2* 4* ( 3 12+ 1 12)

▼

Evaluate right-hand side

AddTerms

Add terms

A=1/2* 4* (5)

Multiply

A=1/2* 20

MoveRightFacToNumOne

1/b* a = a/b

A=20/2

CalcQuot

Calculate quotient

A=10

The area of the trapezoid is 10 square centimeters.

Subchapter links

Try It p.298-300

Self-Assessment for Concepts & Skills p.300

Self-Assessment for Problem Solving p.301

Review & Refresh p.302

Concepts, Skills, & Problem Solving p.302-304

Exercise 18 Page 303

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