Question

pls tell it fast Class 9 Sub Math​

Answer 1

Answer:

QUESTION

19. In the given figure, △ABC is an equilateral triangle and ABDC is a cyclic quadrilateral,

then find the measure of ∠BDC.

ANSWER

△ABC is an equilateral triangle.

∴ ∠BAC = 60°

Now, ∠BDC + ∠BAC = 180°

∠BDC + 60° = 180°

∠BDC = 180° - 60°

∠BDC = 120°