Question

the redio of two consecutive circles are 40 cm and 41 ch. what is the length of a chord of the bigger circle which is tangent to the smaller circle?​

Answer 1

Step-by-step explanation:

ANSWER

OC=40cm,OB=41cm

OC⊥AB since AB is tangent to the smaller circle .

⟹AC+BC

In △OCB

OB

2

=OC

2

+BC

2

⟹BC

2

=41

2

–40

2

=818×1

⟹BC=9cm

⟹AB=2BC=18cm