BPSC 65th Prelims Exam 15 Oct 2019 Solved Paper

Question : 19 of 150

Marks: +1, -0

If the radii of circles

A

and

B

are in the ratio

1.5: 1,

then the areas of the circles

A

and

B

will be in the ratio

Solution:

Explanation: We know that Area of circle

=π r^{2}

(where

r

is radius)
Ratio of the areas of circle A and

{B}= \;\; \;{\;\text " Area of circle "\; {\A}}/{\;\text " Area of circle "\; {\B}}

\;\; =\;{π(r_{ {1}})^{2}}/{π(r_{2})^{2}}=(\;{r_{ {1}}}/{r_{2}})^{2}=(\;{1.5}/{1})^{2}

\;\; =\;{2.25}/{1}=2.25: 1

Go to Question:

Prev Question

Next Question