Question

Can anyone help me in solving this...​

Answer 1

Answer:

(b)80°

Step-by-step explanation:

Given,BC=CA i.e., A=B=40°

ACD=A+B=40+40=80°

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Answer 2

Answer:

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Step-by-step explanation:

angle bac = angle abc (isosceles triangle)

angle abc = 40⁰

angle (abc+bac+acb) = 180⁰(linear pair)

40⁰+40⁰+acb = 180⁰

80⁰+acb = 180⁰

acb = 180⁰- 80⁰

acb = 100⁰

acb+acd = 180⁰(linear pair)

100⁰+acd = 180⁰

acd = 180⁰-100⁰

acd=80⁰

2nd method

bac+cba = acd (exterior angle = sum of opposite angles)

40⁰+40⁰ = acd

acd = 80⁰