Question

The circumference of circle Z is 84cm. What is the length of XY (the minor arc)?

Answer 1

A

Explanation:

The length of the minor arc XY can be calculated using

XY = circumference × fraction of circle

= 84 ×
`(90)/(360)` = 84 ×
`(1)/(4)` = 21 cm → A

Answer 2

21 cm

Explanation:

The circumference is 84

90degrees out of 360 degrees in a circle is 90/360 = 1/4

The arc is 1/4 of the circle, so it is 1/4 of the circumference

1/4 * 84 = 21 cm