Question

the 2 circles with same centre . the radius of large circle is 28m and the radius of small circle is 10m. find​

Answer 1

Answer:

Circumference = 39.6 cm

We know:

Circumference of a circle = 2πr

⇒39.6 =2×

22

7

×r⇒

39.6×7

2×22

=r⇒r=6.3 cm

Also,

Area of the circle = πr2

=

22

7

×6.3×6.3=124.74 cm2

Answer 2

Step-by-step explanation:

ANSWER

(i) Area of the path =π(R

2

−r

2

)

Here,

R=

2

28

+7=14+7=21 m

r=21−7=14 m

Area of the path =π(21

2

−14

2

)

=

7

22

×245

=770 m

2

(ii) Area of circular path =π(R

2

−r

2

)

Here,

R=20+2=22

r=22−2=20 m

Area of circular path =π(22

2

−20

2

)

=

7

22

×84

=264 m

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