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Geometry and Measurement Videos 87 videos
SAT Math 1.1 Geometry and Measurement. What is the circumference of the circle?
SAT Math: Geometry and Measurement Drill 1, Problem 2. If A = (0, 4), B = (-3, 2), and C = (1, 0), which point is in the interior of angle ABC?
SAT Math 1.3 Geometry and Measurement. Find the length of CE.
SAT Math 7.1 Geometry and Measurement 194 Views
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Description:
SAT Math 7.1 Geometry and Measurement
Transcript
- 00:03
I am the one who Shmoops!
- 00:06
Find the area of this trapezoid.
- 00:08
Here are the potential answers...
- 00:12
Okay, so…we’re not given a lot of background here, but apparently we need to find the area
- 00:17
of a trapezoid.
Full Transcript
- 00:19
Maybe this is a floor plan and we’re picking out carpeting?
- 00:22
Or someone has a really odd-shaped head and is thinking about investing in a toupee?
- 00:27
Regardless, let’s use what we know about trapezoids to put this puppy to bed.
- 00:32
The formula for the area of a trapezoid is 1/2 base 1 plus base 2 times height.
- 00:39
All right, Base 1 is the top base, which is labeled “x”...
- 00:43
Base 2 is the bottom base, which is labeled 2x.
- 00:46
And… whaddya know, we’ve got the height, too, which is also x.
- 00:50
Now plug in our three pieces of known information and we should be done…
- 00:55
To get our answer, all we have to do is multiple everything out following PEMDAS…
- 00:59
…we have to do the stuff in parentheses first.
- 01:03
So… x plus 2x is 3x.
- 01:06
Multiplying everything out, we have 1/2 of 3x times x…or 3x squared…
- 01:13
…which gives us 1.5x squared…
- 01:16
…or option B.
- 01:18
This is gonna be one heck of a hairpiece.
- 01:20
Fingers crossed it doesn’t get too windy…
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