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Big Ideas Math: Modeling Real Life, Grade 7

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Big Ideas Math: Modeling Real Life, Grade 7 View details

Practice Test

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Exercise 1 Page 402

The radius of a circle is the distance from the center to any point on the circumference. The diameter is the distance from one side of the circle's circumference, through the center of the circle, to the opposite side.

8.5 inches

We want to find the radius of the circle given its diameter. Let's recall the definitions of radius and diameter.

Radius: Distance from the center of the circle to any point on the circumference.
Diameter: Distance from one side of the circle's circumference, through the center of the circle, to the opposite side.

We are told that the diameter is 17 inches. According to the definitions, the radius is half the diameter. Let's divide the diameter by 2! 17÷ 2 = 8.5 This means that the radius is 8.5 inches.

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