Question

(2) The measure of an arc of a circle is 90° and its length is 11 cm.
What is the diameter of the circle ?
(A) 21 cm (B) 7 cm (C) 14 cm (D) 28 cm​

Answer 1

Answer:

by Pythagoras theorem

11cm^2=2(x)^2

as 2 sides are radii

121=2(x)^2

121/2=(x)^2

60.5=(x)^2

√60.5=x

7.79~x(approximate)

the answer is (B)7cm