Question

ABCD is a guide if angle BCD is 40 degree find angle bdc angle abc q 9 1st diagrams

Answer 1

As summation of all three angles of a triangle is 180° (π radians)

So,
angle CBD + angle BDC + angle DCB = 180°

Now,
side CB = side CD
So,
angle CBD = angle BDC

Therefore,

2(angle BDC) + angle DCB = 180°
2(angle BDC) + 40° = 180°
2(angle BDC) = 140°
angle BDC = 70°
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Now, as ∆ ABD is an equilateral triangle,

There all three angles of ∆ ABD will be 60°

Thus,
angle ABC = angle ABD + angle DBC
angle ABC = 60° + 70°
angle ABC = 130°
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Answer:

angle BDC = 70°

angle ABC = 130°

Answer 2

Answer:

bdc has angle 70

abc has 120

Step-by-step explanation: