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Big Ideas Math: Modeling Real Life, Grade 8

BI

Big Ideas Math: Modeling Real Life, Grade 8 View details

7. Perimeters and Areas of Similar Figures

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Exercise 4 Page 87

Use the formula for the area of a triangle.

7.5in.^2

Practice makes perfect

Let's start by considering the given triangle.

Now, we can recall the formula for the area of a triangle. A=1/2bh We will substitute the value of the base, b= 3, and the value of the height, h= 5, into the formula to calculate A.

A=1/2bh

b= 3, h= 5

A=1/2( 3)( 5)

Multiply

A=1/2(15)

MoveRightFacToNum

a/c* b = a* b/c

A=15/2

Use a calculator

A=7.5

The area of the triangle is 7.5 squared inches.

Subchapter links

Try It p.84-85

Self-Assessment for Concepts & Skills p.85

Self-Assessment for Problem Solving p.86

Review & Refresh p.87

Concepts, Skills, & Problem Solving p.87-88