Question

Area of a circle of diameter 10 cm is...


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Answer 1

Area of circle = pi*r^2
=3.14*(5^2)
=31.4 cm^2

Answer 2

Step-by-step explanation:

Given :-

The diameter of the circle = 10 cm

To find:

Area of a circle whose diameter is 10 cm ?

Solution:-

Diameter of the circle =(d)=10 cm

Radius of the circle (r) = diameter/2

=>r= 10/2

=>r=5 cm

Radius of the circle = 5cm

Area of a circle whose radius is "r" units

= πr² sq.units

=π(5)² sq.cm

=>(22/7)×25 sq.cm

=>(22×25)/7 sq.cm

=>22×25/7 sq.cm

=>550/7 sq.cm

=>78.57 sq.cm

(or)

Diameter of the circle (d)=10 cm

Area of a circle whose diameter is d units

= πd²/4 sq.units

=>(22/7)×10²/4 sq.cm

=>(22×100)/(7×4) sq.cm

=>22×25/7 sq.cm

=>550/7 sq.cm

=>78.57 sq.cm

Therefore ,Area of the circle = 78.57 sq.cm

Answer:-

Area of the circle for the given problem is

78.57 sq.cm

Used formulae:-

• Area of a circle of radius "r" units = πr² sq.units
• Area of a circle of diameter 'd" units = πd²/4 sq.units
• π=22/7