no.(b) please help me please.
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Step-by-step explanation:
we know that the line joining the centre of the circle and the mid point is perpendicular to
to the chord.
in right angled triangle, OPA,
OA=13cm (radius)
OP=12 cm(given)
thus,
by Pythagoras theorem,
AP=√(13²-12²
=5 cm
thus,
(a)-AB (length of the chord)=2*5 cm=10 cm
similarly,
(b)-AP=√(12²-9²)
= √63cm =3√7 cm
thus,AB(length of the chord)=2*3√7 cm=6√7 cm
NOTE:√(ab)=√a *√b
e.g √63=√(9*7)=√9*√7=3√7
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