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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 2.1 Plane Geometry 484 Views
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Description:
ACT Math: Plane Geometry Drill 2, Problem 1. What is the perimeter of the shape shown?
Transcript
- 00:02
Here is your shmoop de jour...
- 00:05
What is the perimeter of the shape below?
- 00:08
And here are the potential answers...
- 00:13
Okay the key thing we have to notice here is this distance 4
- 00:16
which is exactly half of this distance 8
Full Transcript
- 00:20
and this distance 3 which is exactly half of this distance 6
- 00:24
Suddenly have a right triangle with sides 3 he ran for their
- 00:28
and thanks to Pythagoras we know that a squared plus B squared equals C squared
- 00:34
that 3 squared 9 plus 4 squared 16
- 00:38
equals by square 25 take the square root of 25 and thats how we got 5
- 00:42
thing. Now just add the perimeter lines and we have 3 plus
- 00:46
8 plus 6 plus 4 plus 5 and our perimeter here is 26.
- 00:51
Answer D.
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