Chasing the angle is not work anymore
is a isosceles triangle which
and
Given
. What is the angle of
in degree.
The answer is 10.
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1 solution
Let ∠ C B D = x, ∠ D B A = y and ∠ C D B =z
x+y=80 (isosceles triangle)
x+z=160(angle sum theory)
y+z=100(angle sum theory)
solving x.y.z we find
x=10= ∠ C B D