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ACT Math Videos 164 videos
ACT Math: Trigonometry Drill 1, Problem 1. What is the length of y?
ACT Math: Coordinate Geometry Drill 1, Problem 2. Solve the inequality and determine which solution is shown on the number line.
ACT Math 2.3 Plane Geometry 244 Views
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Description:
ACT Math: Plane Geometry Drill 2, Problem 3. What is the perimeter of the object in the video?
Transcript
- 00:02
And here's your shmoop de jour...
- 00:04
What is the perimeter of the object below?
- 00:07
And here are the potential answers...
- 00:11
It's all about visualization -- can we see 2 rectangles here?
- 00:15
We are being asked for the perimeter, which is the distance all the way around...
Full Transcript
- 00:15
We are being asked for the perimeter, which is the distance all the way around…
- 00:19
...so we are just going to add a bunch of numbers together.
- 00:22
And we can fill some in... this line is the same length as this line so we can label it
- 00:27
with a "3"... this line is the same distance as that line so we can put a "5" here...
- 00:32
So all that's left is figuring out this line. We know the height is 6 because of this
- 00:37
4 and this 2...
- 00:39
...so we can subtract this 4 from 6... and we know that this line is also 2.
- 00:44
Now we just add the numbers -- and we have 4 plus 3 plus 2 plus 5 plus 4 plus 5 plus
- 00:50
2 plus 3... is 28.
- 00:52
The answer is B.
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