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Sagot :

Answer:

8. C=131.88 mm

9. C=40.82 ft

10. A=254.34 in²

Step-by-step explanation:

8. diameter of 42 millimeters- circumference?

Radius is half of 42, so 21 mm

Circumference=2πr

C=2π21

C=131.88 mm

9. diameter of 13 ft- circumference?

radius is half of 13, so 6.5

Circumference=2πr

C=2π6.5

C=40.82 ft

10. radius of 9 in- area?

Area=πr²

A=π9²

A=π81

A=254.34 in²

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