P6 23rd March 2022 (Wednesday with GenieAsk)

O is the ________ of the circle.

The perimeter of a circle is its __________________ .

Line AO is the ________ of the circle.

Line AB is the _______ of the circle.

Given that line AB is 14 cm, the radius of the circle is ______ cm.

Find the length of the arc of the semicircle if AB is 21 cm.

(Take π=3.14 .)

Find the perimeter of the semicircle if AB is 21 cm.

(Take π=3.14 .)

Find the perimeter of the quarter-circle if OA is 7 cm.

(Take π=3.14 .)