Mensuration Practice Test 2

Question : 19 of 40

Marks: +1, -0

If the diameter of a circle is doubled, its area will become:

Solution:

Diameter of the circle = 4 cm
Radius = 2 cm
Diameter doubled = 8 cm
Radius 1 = 4 cm

{\Area \of \circle]/{\Area \of \circle}

{πr_1^2}/{πr^2}

{π(4)^2}/{π(2)^2}

{16}/4

= 4 times

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