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ACT Mathematics Videos 164 videos

Inequalities in Number Lines
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ACT Math 2.4 Plane Geometry 469 Views


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Description:

ACT Math: Plane Geometry Drill 2, Problem 4. What is the surface area of a sphere with radius = 6?

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Transcript

00:02

For a good time, solve this shmoopy question.

00:04

What is the surface area of a sphere with radius = 6?

00:09

And here are the potential answers...

00:13

Alright, so what is this question asking? Well, you have to have memorized

00:17

the formula for the area of a sphere.

00:20

It's 4 times pi times radius squared.

00:23

The evil test overlords have given us the radius --

00:26

it's 6.

00:27

So all we have to do is plug it in and do the math.

00:32

It's 4 times pi times 6 squared. Well, we know 6 squared is 36 so we just simplify by

00:38

multiplying 36 times 4 to get 144.

00:42

The answer is C - 144 pi.

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