Correct Answer - Option 1 : 77 cm

**GIVEN:**

T.S.A of hemisphere = 55902 sq.cm

**FORMULA USED:**

T.S.A of hemisphere = 3πr^{2}

**CALCULATION:**

Radius = r cm

A.T.Q

3 × 22/7 × r^{2} = 55902

r^{2} = (55902 × 7)/(22 × 3)

r2 = 847 × 7 = 11 × 11 × 7 × 7

r = 11 × 7 = 77 cm

**∴ Radius of the hemisphere is 77cm.**