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CAHSEE Math 3.3 Measurement and Geometry 199 Views


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Description:

Measurement and Geometry Drill 3 Problem 3. What is the total area, in square inches of the wooden frame?

Language:
English Language

Transcript

00:03

Here’s a shmoopy question, comin’ at ya…

00:06

An actor who really, really likes the way he looks would like to prominently display one of his headshots.

00:12

He has an 8x10 inch photo that he wants to put into a wooden frame.

00:16

The total dimensions of the headshot and the frame together are 12 in by 14 in.

00:22

What is the total area, in square inches (in2) of the wooden frame?

00:26

And here are the potential answers...

00:31

This question is testing one thing: Do we know the formula for the area of a plane?

00:37

Wrong plane.

00:40

We’ll have to do some subtracting and be sure we totally understand what they are asking.

00:43

So draw a little picture – it’s THIS area that they are asking us to find and to get

00:48

it, we need to subtract the interior area from the bigger exterior area… i.e. the

00:53

picture’s area from the frame’s area.

00:57

The area for the picture is just 8 times 10 or 80 square inches.

01:02

And the area for the frame is 12 times 14… which gets us 168 square inches.

01:09

So to get that inner area-thing here...

01:12

Subtract 80 from 168 and we get 88 or B.

01:18

As in… “Beauty is in the eye of the beholder.”

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