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McGraw Hill Glencoe Geometry, 2012 View details

4. Volumes of Prisms and Cylinders

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Exercise 57 Page 870

Recall the formula for finding the area of a circle.

11.4cm

Practice makes perfect

The area of a circle with radius r is calculated using the formula below. A=π r^2From the exercise, we know that the area of the circle is 102cm^2. By substituting 102 for A in the formula, we can calculate r.

A=π r^2

Substitute

A= 102

102=π r^2

▼

Solve for r

DivEqn

.LHS /π.=.RHS /π.

102/π = r^2

SqrtEqn

sqrt(LHS)=sqrt(RHS)

sqrt(102/π) = r