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31 August, 06:55

The planet Mars could be a future destination for the U. S. space program. Assume that Mars is a perfect sphere. Its surface area is about 145 million square kilometers. What is the radius of Mars at its equator? Round to the hundreds place.

||| Answer choices:

A) 4,500 km

B) 2,200 km

C) 5,000 km

D) 3,400 km |||

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Answers (1)
  1. 31 August, 09:16
    0
    Surface area of a sphere is 4 times pi timers radius^2

    aprox pi=3.14

    so surface area=145,000,000

    145,000,000=4 times 3.14 times rdaius^2

    145,000,000=12.56 times radius^2

    divide both sdies by 12.56

    11544585.987=r^2

    square root both sides

    3397.73=radius

    round to the hundreds

    3397 rounded to the hundreds

    3400

    the answer is D 3,4000 km
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