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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 |||
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
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