Question

One circle has a radius of 98 cm and a second concentric circle has a radius of l m 26 cm
How much longer is the circumference of the second circle than that of the first?
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Answer 1

Answer:

144π cm

Step-by-step explanation:

2π(98)-2π(26)=144π

Answer 2

Step-by-step explanation:

circumference of first circle whose radius is 98 cm

circumference of circle = 2 π r

2 × 22/7 × 98 cm

= 2 × 22 × 14

= 44 × 14 cm

616 cm

circumference of second circle whose radius is

1 m 26 cm or ( 1 × 100 +26 ) cm = (100 +26 )

126 cm

circumference of second circle = 2 π r

2 × 22 /7 × 126 cm

= 2 × 22 × 18 cm

44 × 18 cm

792 cm

difference = ( 792 - 126 ) cm = 666 cm

the circumference of second circle is 666 cm

longer than the first one.