Question

8. A circle has a diameter of 15.6 cm. How many
points on the circle will lie at a distance of
7.2 cm from the centre?​

Answer 1

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Consider the above figure, the radii of the first circle is AP=3 cm and the radii of the second circle is QB=8 cm.

Now since AP=3, therefore QC=3 and thus BC=QB−QC=8−3=5

We find the length AC as follows:

AC=

13

2

−5

2

=

169−25

=

144

=12

Hence, PQ=AC=12 cm.