35. The area of a square is 100 cm². The circumference (in cm) of the largest circle cut out of it is
(a) 5π
(b) 10π
(c) 15π
(d) 20π
Side of square = √100 = 10 cm.
Diameter of inscribed circle = 10 ⇒ radius = 5.
Circumference = 2πr = 10π.