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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 14 Page 295

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

189 mm^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.

Let's rotate the figure to make it easier to recognize the base and the corresponding height!

After rotating the triangle, we can see that the base is 18 millimeters and that the height is 21 millimeters. 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= 18, h= 21

A=1/2( 18)( 21)

▼

Evaluate right-hand side

Multiply

A=1/2(378)

MoveRightFacToNumOne

1/b* a = a/b

A=378/2

Calculate quotient

A=189

The area of the triangle is 189 square millimeters.

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