Question

Estimate the area of the circle .Use 22 over 7.

Answer 1

Answer:

Area of a circle(A) is given by:

$A= \pi r^2$           ....[1]

where,

r is the radius of the circle.

As per the statement:

From the given image of circle:

Diameter(d) = 28 cm

Using formula:

$d = 2r$

then;

$28 = 2r$

Divide both sides by 2 we have;

14 cm = r

or

r = 14 cm

Substitute r =14 cm and use $\pi = \frac{22}{7}$ in [1] we have;

$A = \frac{22}{7} \cdot 14 \cdot 14 = 22 \cdot 2 \cdot 14 = 44 \cdot 14 = 616 cm^2$

therefore, the area of the circle is, 616 square cm

Answer 2

Area=pi times radius^2

the 28 is a diameter
radius is 1/2 of diameter
28/2=14

area=pi times 14^2
pi=22/7 for this quesiton
area=22/7 times 14^2
area=22/7 times 196
area=4312/7
area=616 cm^2

answer is 616 square centimeers