Question

two concentric circles are of radii 29 cm and 20 cm find the length of the chord of the larger circle which touches the smaller circle​

Answer 1

Two concentric circles having radii 7 and 25 are given. The chord of the circle with larger radius touches the circle with smaller radius, then find the length (in cm) of the chord.

Answer

Correct option is

A

48

REF.Image

AB=?

In ΔOAC-

OA

2

=α

2

+AC

2

25

2

=7

2

+AC

2

AC

2

=625−49=576

AC=24

Similarly

In ΔOCB-

OB

2

=OC

2

+BC

2

25

2

=7

2

+BC

2

BC

2

=625−49

BC=24

AB=AC+CB

AB=48cm

solution

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