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Geometry and Measurement Videos 88 videos

SAT Math 2.1 Geometry and Measurement
2779 Views

SAT Math 2.1 Geometry and Measurement. What is the measure of angle z in terms of x and y?

SAT Math 1.1 Geometry and Measurement
719 Views

SAT Math 1.1 Geometry and Measurement. What is the circumference of the circle?

SAT Math 1.2 Geometry and Measurement
246 Views

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?

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SAT Math 2.5 Geometry and Measurement 258 Views


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SAT Math 2.5 Geometry and Measurement


Transcript

00:02

Here’s your shmoop du jour, brought to you by isosceles triangles. I came, I saw, I sosceles.

00:11

Triangle ACD is an isosceles triangle, and CD is parallel to BE.

00:16

What is the perimeter of triangle ABE?

00:20

Here are the potential answers...

00:24

Okay, so times are hard, and there’s a mad cheese shortage.

00:27

So…we have to leave out a smaller hunk of cheese to catch that mouse who’s been running

00:31

around our office like he owns the place…

00:33

Okay, our cheese triangle needs a downgrade. Now… because we’re told that CD is parallel

00:37

to BE, we know that triangles ABE and ACD are similar.

00:42

We’re also told that ACD is an isosceles triangle… and because all similar triangles

00:47

maintain the same proportions, we know that ABE is isosceles as well.

00:52

And THAT means that sides AD and AC are equal.

00:58

We can subtract the 6 they give us from 16 to get a side length

01:01

for AB of 10… which is also the length of AE.

01:06

And it’s mere addition from here to get our perimeter… 10 plus 10 plus 8 is 28…

01:10

…Answer is B. As in “brie.”

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