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ACT Mathematics Videos 164 videos
ACT Math: Coordinate Geometry Drill 1, Problem 1. Which inequality is expressed by the number line?
ACT Math: Intermediate Algebra: Drill 3, Problem 1. Find the fifth number in the series.
ACT Math: Pre-Algebra Drill 1.2. What proportion of Jenna's day is spent Wii-swimming?
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.
- Plane Geometry / Plane figures (triangles, rectangles, parallelograms, trapezoids, circles, polygons)
- Product Type / ACT Math
- Foreign Language / Spanish Subtitled
- Foreign Language / Korean Subtitled
- Foreign Language / Chinese Subtitled
- Foreign Language / Arabic Subtitled
- Plane Geometry / Properties of plane figures
- Plane Geometry / The concept of proof and proof techniques
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
Full Transcript
- 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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