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ACT Mathematics Videos 164 videos
ACT Math: Coordinate Geometry Drill 1, Problem 1. Which inequality is expressed by the number line?
ACT Math: Intermediate Algebra: Drill 3, Problem 1. Find the fifth number in the series.
ACT Math: Pre-Algebra Drill 1.2. What proportion of Jenna's day is spent Wii-swimming?
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?
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.
Full Transcript
- 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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