find the value of a. please answer my question
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Answer:
Step-by-step explanation:
AB||CD AND BC IS A TRANSVERSAL
THEREFORE, ANGLE ABC = ANGLE BCD (ALT. INT. ANGLES)
ANGLE BCD = 85°.
NOW, RS||CD AND RC IS A TRANSVERSAL
THEREFORE, ANGLE SRC + ANGLE DCR = 180° (CO-INT. ANGLES)
ANGLE DCR + 120° = 180°
ANGLE DCR = 180° - 120° = 60°
NOW, ANGLE BCR + ANGLE DCR = ANGLE BCD
a + 60° = 85°
a = 85° - 60°
a = 25°
(You can replace "ANGLE" by angle symbol )
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Answer:
The value of a+b is a+b. In other words, add a to b. Of course, it would be more meaningful if there were VALUES given to a and b, like a= 3 and b = 4.