To have a congruent angle, the measure of the two angle must be the same, so if ABC is 15 degrees, then FDE would have to be 15 degrees also to be congruent.
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Without seeing the picture, I can't tell what's already known to be congruent, so there's no way I can figure out what 'else' is needed.
A = 60 B = 20 C = 140 This can have a large number of answers.
the answer is 68 degrees
Angle ABD = 4x - 4 Angle ABC = twice angle ABD = 7x + 4 So 7x + 4 = 2*(4x - 4) = 8x - 8 So x = 12 Then angle DBC = half of angle ABC = 1/2*(7*12 + 4) = 1/2*88 = 44 degrees.