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Big Ideas Math: Modeling Real Life, Grade 6

BI

Big Ideas Math: Modeling Real Life, Grade 6 View details

2. Areas of Triangles

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Exercise 12 Page 295

To find the area, calculate half of the product of the base and the height.

90 mi^2

Practice makes perfect

Let's find the area of the given triangle. The area of a triangle is half the product of its base and its height.

In the given triangle, we can see that the base is 20 miles and that the height is 9 miles. We can substitute these two values into the formula for the area of a triangle and simplify. Let's do it!

A=1/2bh

b= 20, h= 9

A=1/2( 20)( 9)

▼

Evaluate right-hand side

Multiply

A=1/2(180)

MoveRightFacToNumOne

1/b* a = a/b

A=180/2

Calculate quotient

A=90

The area of the triangle is 90 square miles.

Subchapter links

Try It p.292-293

Self-Assessment for Concepts & Skills p.293

Self-Assessment for Problem Solving p.294

Review & Refresh p.295