Question

radii of circle are given below find their areas radii=7.7cm and 15.4 cm​

Answer 1

Step-by-step explanation:

First circle area = 22÷7*r square

= 22÷7*7.7*7.7

= 9317 ÷ 50

= 186. 34

Second circle area = 22 ÷7*r square

=22÷7*15.4*15.4

= 18634÷25

= 745.36

Answer 2

Answer :

• The area of circle is 186.34cm².
• The area of circle is 745.36cm².

Step-by-step explanation ::

To Find :-

• The areas of the two circles

Solution :-

Formula used ::

Area of circle = πr² sq. units

• The area of circle having the radius 7.7cm

As we know that,

Area of circle = πr² sq. units,

➮ Area = 22/7 × ( 7.7 )²

➮ Area = 22/7 × 7.7 × 7.7

➮ Area = 22 × 1.1 × 7.7

➮ Area = 24.2 × 7.7

➮ Area = 186.34

The area of circle is 186.34cm²

• The area of circle having the radius 15.4cm

As we know that,

Area of circle = πr² sq. units,

➮ Area = 22/7 × ( 15.4 )²

➮ Area = 22/7 × 15.4 × 15.4

➮ Area = 22 × 2.2 × 15.4

➮ Area = 48.4 × 15.4

➮ Area = 745.36

The area of circle is 745.36cm².