Question

In ΔABC with usual notations, if ∠A = 30° and a = 5, then `s/(sumsinA)` is equal to ______.

विकल्प

• 3.00

• 4.00

• 5.00

• 6.00

Answer 1

In ΔABC with usual notations, if ∠A = 30° and a = 5, then `s/(sumsinA)` is equal to 5.00.

Explanation:

`(a + b + c)/(2[sinA + sinB + sinC])`

= `(2R[sinA + sinB + sinC])/(2[sinA + sinB + sinC])`

= R = `5/(2sinA)` = `5/(2sin30^circ)` = 5