Answer :

In a circle, the sum of two diameters = 200 mm

Let diameter be d and radius be r of a circle.

⇒ d + d = 200 mm

⇒ 2d = 200 mm

∴ d = 100 mm

__We know that Diameter = 2(Radius).__

⇒ 100 = 2r

⇒ r = 100 ÷ 2

∴ r = 50 mm

__We know that 1 cm = 10 mm.__

⇒ r = 50 ÷ 10 = 5 cm

∴ The radius of the circle is 5 cm.

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