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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?

Language:
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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...

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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