Question

4. The diameter of a circle is a line which joins two points on the
circle and also passes through the centre of the circle. (In the
adjoining figure (Fig 11.12)AB is a diameter of the circle; C is
its centre.) Express the diameter of the circle (d) in terms of its
radius (r).
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Answer 1

Since AB is the diameter,AB= 2r

Answer 2

Solution :-

Diameter AB = AC + CB

orㅤㅤㅤㅤ$d$ = CP + CP

ㅤㅤㅤㅤㅤ$d$ = $r + r = 2r$