triangle ABC, side BC is extended to D, m<A=x, m<BCA=3x, and m<ACD=4x. What is m<B?

m<A=x

m<BCA=3x

m<ACD=4x

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1 Answer

using the extior angle of a triangle = the sum of the opposite 2

<b = 3x

the triangle is isoceles.

also we know that the 3 angles of a triangle = 180

so 3x + 3x + x = 180

7x = 180

x = 180/7

by Level 10 User (55.7k points)

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