ACT Math 1.3 Plane Geometry
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ACT Math: Plane Geometry Drill 1, Problem 3. What does Angle 15 measure in the given diagram?
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In our diagram were only told the measure of angle 4
So how does that get us to 15? Well if we know about
vertical angle we should know that angle 7
the one opposite angle 4 is also 105 degrees
Next because we're told a and b are parallel we should realize that angle 7 and 15
would have the same measure.
So our answer is D.