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Question
The ratio of the radii of two circles is 1 : 3. The ratio of their areas is :
1 : 3
1: 6
1 : 9
None of these
ANSWER : 3
Descrption
<p class = "MsoNormal" style = "margin - bottom: 0in; line - height: 18.0pt;"><span style = "font - size: 13.5pt; font - family: 'Helvetica',sans - serif; mso - fareast - font - family: 'Times New Roman'; mso - bidi - font - family: 'Times New Roman'; color: black;">Let the radii of circles be r and 3r<br /><br />Area of 1st circle = πr^2<br /><br />A1 = πr^2 - - - - - - (1)<br /><br />Area of 2nd circle = π*(3r)^2<br /><br />A2 = 9 πr^2 - - - - - - (2).<br /><br />A1 : A2 = (πr^2) / 9 (πr^2)<br /><br /> = 1/9<br /><br /> = 1:9 (Ans)</span></p>
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