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balandron [24]
3 years ago
6

PLEASE HELP What is the measure of angle 1? m∠1=__________°.

Mathematics
2 answers:
Arisa [49]3 years ago
8 0
Ok so lets first determine all the angles of the triangle.
Given:
Angle A = 90
Angle B = 45
Angle C = ?

If we add up all the angles of any triangle, we should get 180 degrees.
Therefore, Angle C = 90 (angle A) - 45 (angle B) = 45 degrees.

Since there was a ray drawn from A through C the exterior angle of angle C is angle 1.
Any straight line should equal to 180 degrees.
Therefore, angle 1 = 180 - angle C = 135

Answer: angle 1 = 135 degrees
sp2606 [1]3 years ago
4 0
The angle is 135 ;)
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