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Big Ideas Math Geometry, 2014

BI

Big Ideas Math Geometry, 2014 View details

Maintaining Mathematical Proficiency

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Exercise 5 Page 591

Use the formula for the area of a triangle.

2 cm

Practice makes perfect

We are looking for the base of a triangle. We can do this by using the formula for calculating the area of a triangle. A=1/2bh Now we substitute the value of the area, A= 12, and the value of the height, h= 12, into the formula to calculate b.

A=1/2bh

A= 12, h= 12

12 = 1/2b( 12)

▼

Solve for b

LHS * 2=RHS* 2

24 = 12b

Rearrange equation

12b = 24

.LHS /12.=.RHS /12.

b = 2

The base of the triangle is 2 cm.

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Exercises p.591