Question

The diameter of a circle is 7cm. it's circumference is what??

Answer 1

Diameter of circle = 7cm
Radius of circle = 7/2 cm
Circumference of circle = 2 pi r
= 2 *22*7/2*7
= 22 cm

Answer 2

Circumference= 2×pie× diameter/2
C= 2 ×22/7 × 7/2
Circumference= 22 cm
Hope it helps