Question

(25) The chord of length 30cm is drawn at the distance of 8cm from the centre of the
circle. Find the radius of the circle.
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Answer 1

Step-by-step explanation:

length of chord = 30

we know that a perpendicular on the Chord from the centre of a circle bisects the chord

So, half of chord = 15

perpendicular distance = 8

so radius = √(15square + 8square) (by Pythagoras theorem)

= √(225+64)

=√289

= 17 cm

Answer 2

Answer:

r=17

Step-by-step explanation:

length of chord =30 cm

distance (centre to chord)=8cm

*the line from the centre divides chord in two equal parts*

30/2=15

by pythagoras theorem

h²=b²+p²

h²=(15)²+(8)²

h²=225+64

h²=289

h=17

since h=r so r=17