Question

A chord 20cm long is 12cm from the center of a circle calculate, correct to one decimal place

Answer 1

draw a diagram. Cut the chord in half with a radius drawn through its center.

Now you can see that the radius r is

r^2 = 10^2 + 12^2

If the radius is not what you want, then maybe you should have proofread your post...

Answer 2

radius =15.6205
angle substended=79.62

Answer 3

be the angle between the radius and length of the
chord from the centre. Then,
. Therefore, angle subtended by the chord at the centre
of the circle is 2
39.8o = 79.60 (Correct to 1 decimal place).
Also, in part (b) (ii), the perimeter of the minor segment
is
, where
= 15.62 cm.