Practice Test

Question 4 • Grade 7 Mathematics

Eugene knows the circumference of a circle is 125 point 6 meters. Does he have enough information to find the area?

Answer

Yes, because the area will just be twice the circumference so all he has to do is multiply by 2 .

No, because the circumference equals cap c is equal to open paren d i A m e t e r close paren times pi so he could only find the diameter. He needs the radius for the area formula.

Yes, because he could divide by 3 point 1 4 to find the diameter and then divide that result by 2 to find the radius. Once he has the radius, he can use the formula.

No, because the circumference equals cap c is equal to open paren d i A m e t e r close paren times pi and there is no pi in 125 point 6 .

Explanation

Yes. Use the circumference formula, C = πd, to find the diameter: 125.6 ÷ 3.14 = 40 meters. Divide the diameter by 2 to get the radius, then use A = πr² to find the area. So Eugene has enough information; choice C correctly describes how to proceed.

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