An asteroid hit the earth and created a huge round crater. Scientists measured the distance around the crater as $94.2$ miles. What's the diameter?

12.5

miles

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30

miles

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50

miles

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Solution

The correct option is B $30$ miles
Given: Circumference of the crater $= 94.2$ miles

Circumference of a circle $= 2 π r$

There's nothing specific given about the value of $π$ , hence, we can solve using either $3.14$ or $\frac{22}{7}$ .

$94.2 = 2 \times 3.14 \times r$

$94.2 = 3.14 \times d$ (As $2 r = d$ )

$\frac{94.2}{3.14} = d$

$d = 30$ miles

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An asteroid hit the earth and created a huge round crater. Scientists measured the distance around the crater as 94.2 miles. What's the diameter?

The correct option is B 30 milesGiven: Circumference of the crater =94.2 miles Circumference of a circle =2πr There's nothing specific given about the value of π, hence, we can solve using either 3.14 or 227. 94.2=2×3.14×r 94.2=3.14×d (As 2r=d) 94.23.14=d d=30 miles

An asteroid hit the earth and created a huge round crater. Scientists measured the distance around the crater as $94.2$ miles. What's the diameter?