Exercise 3 Page 299

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

30mm^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.

Let's rotate the figure to make it easier to see the height and the bases!

We can see that the height of the trapezoid is 5 millimeters and the bases are 4 millimeters and 8 millimeters. 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* 5* ( 4+ 8)

▼

Evaluate right-hand side

AddTerms

Add terms

A=1/2* 5* (12)

Multiply

A=1/2* 60

MoveRightFacToNumOne

1/b* a = a/b

A=60/2

CalcQuot

Calculate quotient

A=30

The area of the trapezoid is 30 square millimeters.

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 3 Page 299

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