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Big Ideas Math: Modeling Real Life, Grade 6

BI

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

3. Areas of Trapezoids and Kites

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Exercise 3 Page 302

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

25 ft^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, the base is 12 12feet and that the height is 4 feet. 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= 12 12, h= 4

A=1/2( 12 12)( 4)

▼

Evaluate right-hand side

a bc=a* c+b/c

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

Multiply

A=1/2(24+1/2)(4)

Add terms

A=1/2(25/2)(4)

Multiply fractions

A=25/2* 2* 4

Multiply

A=25/4* 4

FracMultDenomToNumber

a/4* 4 = a

A=25

The area of the triangle is 25 square feet.

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