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Understand congruence in terms of rigid motions Videos 5 videos
ACT Math: Plane Geometry Drill 1, Problem 2. In the following diagram, what does Angle 2 measure?
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ACT Math 1.2 Plane Geometry 368 Views
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Description:
ACT Math: Plane Geometry Drill 1, Problem 2. In the following diagram, what does Angle 2 measure?
- Plane Geometry / Parallel and perpendicular lines
- Product Type / ACT Math
- Foreign Language / Arabic Subtitled
- Foreign Language / Korean Subtitled
- Foreign Language / Spanish Subtitled
- Foreign Language / Chinese Subtitled
- Geometry / Congruence
- Geometry / Understand congruence in terms of rigid motions
- Congruence / Understand congruence in terms of rigid motion
- Plane Geometry / Properties of plane figures
- Plane Geometry / The concept of proof and proof techniques
Transcript
- 00:02
Gettin' shmoopy with it...
- 00:05
In the following diagram, lines A and B are
- 00:07
parallel. Line C is perpendicular. Angle 4 measures 105°.
- 00:12
What does Angle 2 measure?
- 00:13
And here are the potential answers...
Full Transcript
- 00:17
OK so what is this question asking?
- 00:19
Yeah -- line D... and the measurement of Angle 4... are total decoys.
- 00:23
All we need to recognize is that, because C is perpendicular to A...
- 00:28
...All of the angles located at the intersection of those two lines will be 90 degrees.
- 00:34
In fact, that little square thingy tells us the same thing... that we're dealing with right angles.
- 00:39
So our answer is C.
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