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ACT Math 4.4 Plane Geometry 340 Views


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Description:

ACT Math: Plane Geometry Drill 4, Problem 4. Find the value of x.

Language:
English Language

Transcript

00:02

For a good time solve this shmoopy question... Find the value of X?

00:06

And here are your options...

00:10

Okay, so we just need to find X. First we need to determine the last mystery angle in the quadrilateral

00:17

since X in the quadrilateral angle combined to make a straight angle

00:21

which is always a 180 degrees. A quadrilateral's

00:24

angles measure 360-degrees so

00:27

to find the last angle in the quadrilateral we can take

00:31

360 minus the quantity 120 plus 125 plus 55

00:36

so 120 plus 125 plus 55 is 300

00:40

we get 360 -300 and that's 60

00:43

we want X plus 60 equal 180

00:46

so we subtract 60 from both sides

00:49

and X equals 120. Answer choice D.

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