The radius of a circle is 28 cm. Find
its circumference.
The diameter of a cart wheel is 1.4 m.
Find its circumference. 40
Find the area of a circle with radius 7 cm.
3
Find the area of a circle with diameter
7 m. 398
345 - 5
Find the area of a circle with circumference
Answers
Q1) The radius of a circle is 28 cm. Find its circumference
Ans: Circumference of a circle = 2 pi r
= 2 * 22/7 * r
= 2 * 22/7 * 28
Circumference = 176cm
Q2) The diameter of a cart wheel is 1.4 m . Find its circumference
Ans: Circumference of a circle = 2 pi r
= 2 * 22/7 * r
= 2 * 22/7 * 1.4/2
= 2 * 22/7 * 0.7
Circumference = 44m
Q3) Find the area of a circle with radius 7 cm
Ans: Area = pi * r sq
= 22/7 * 7 sq
= 22/7 * 7 * 7
= 22 * 7
Area = 154cm
Q4) Find the area of a circle with diameter 7 m
Ans: Area = pi r sq
= 22/7 * 7/2 sq
= 22/7 * 3.5 sq
= 22/7 * 3.5 * 3.5
= 22/7 * 12.25
= 22 * 1.75
Area = 38.50m
Hope it is helpful to you my friend