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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.
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ACT Math 1.3 Plane Geometry 605 Views
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Description:
ACT Math: Plane Geometry Drill 1, Problem 3. What does Angle 15 measure in the given diagram?
Transcript
- 00:02
We are getting shmoopy with it.
- 00:04
In the following diagram lines A&B are parallel Plan C is perpendicular angle
- 00:09
four measures the 105 degrees what his angle 15 measure
- 00:13
Hear the potential answers...Pausing.
- 00:17
Well it just want to make sure we have a basic understanding of angles.
Full Transcript
- 00:21
In our diagram were only told the measure of angle 4
- 00:24
So how does that get us to 15? Well if we know about
- 00:28
vertical angle we should know that angle 7
- 00:32
the one opposite angle 4 is also 105 degrees
- 00:35
Next because we're told a and b are parallel we should realize that angle 7 and 15
- 00:41
would have the same measure.
- 00:43
So our answer is D.
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