Question 1123281
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Under the given condition,


< A + < E = 180°.  Hence, < B + < C + < d = 540° - 180° = 360°.


Also, < B = 7x,  < C = 3x  and < D = 8x,  where unknown "x" is the common measure of these 3 angles.


So we have  7x + 3x + 8x = 360°,  which implies  x = 360/18 = 20°.


<U>Answer</U>.  < B = 7x = 140°;  < C = 3x = 60°;  < D = 8x = 160°.
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Solved.