janetcooly
30.08.2019 •
Mathematics
Given, line l and line m are parallel. if m∠1 = 60°, and m∠2 = 125°, what is m∠3?
95°
105°
115°
125°
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Ответ:
Because the sum of angles on a straight line is 180°, therefore
m∠2 + m∠x = 180°
125° + m∠x = 180°
m∠x = 180 - 125 = 55°
Because the sum of angles in a triangle is 180°, therefore
m∠1 + m∠x + m∠y = 180
60 + 55 + m∠y = 180
m∠y = 180 - 60 - 55 = 65°
Because the sum of angles on a straight line is 180°, therefore
m∠3 + m∠y = 180
m∠3 + 65 = 180
m∠3 = 180 - 65 = 115°
m∠3 = 115°
Ответ:
A. Given
B.Measure of ABC=90
C.Angle addition Prostulate
D.2 times the measure of angle CBD=90
Step-by-step explanation: