ΔABC-এ ∠B = 90° যদি AC = 2BC হয় তবে ∠C = ?

ΔABC-এ ∠B = 90° যদি AC = 2BC হয় তবে ∠C = ?

A 30°

B 45°

C 60°

D 70°

Solution

Correct Answer: Option C

CosC = BC/AC
         = BC/2BC
          = 1/2
          = Cos60°
∴     C = 60°