Question

In Delta*A * B * C, a = sqrt(3) + 1, b = sqrt(3) - 1 and C = 60 degrees then CosC = ​

Answer 1

Correct option A →q; B → r; C →p; D →q Explanation: CA = b = 1 + √3 BC = a = 2, cosC = 1/2

∆DEF is pedal triangle of ∆ABC ∠DEB = π/2 - A ⇒ ∠DEF = π - 2A (A) Circum scribing circle = EF/(sin(EDF)) .