Question

find the length of Chord which is at the distance of 4 cm from the centre of circle having radius 5cm

Answer 1

hope it helps you....

Answer 2

length of a chord
let and O is centre of circle OT is perpendicular to a chord from centre of circle.
PQ is chord of circle = 2PT
OT = 4cm ,O P= 5 cm then
in ∆OTP by PGT
OP^2 = OT^2 + PT ^2
25 = 16 + PT^2
PT =3. CM
OT = 2 PT
OT = 6 CM