ΔABC ରେ, AC = BC ଏବଂ ∠ABC = 50°, ବାହୁ BC କୁ D ପର୍ଯ୍ୟନ୍ତ ବଢାଯାଏ ଫଳରେ   BC = CD ତେବେ ∠BAD ର ମୂଲ୍ୟ ହେଉଛି:

1
80 °
2
40 °
3
90 °
4
50 °

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