Question

find the unknown marked angle in each of the following figure ​

Answer 1

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Given,

AB = AC

So, by isosceles Δ property,

\_ ABC = \_ ACB = Let x

So in Δ ABC,

x + x + 40 = 180 .... Angle sum property

2x = 140

x = 70

So, \_ ABE = 180 - \_ ABC

\_ ABE = 180 - 70 = 110

\_ ABE = \_ ACD = 110

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