Question

234
ICSE Essential Mathematics
11. Find the circumference of a circle whose area is 16 times the area of the circle witफाइंड थे सरकम्फ्रेंस आफ ए सर्किल व्होस एरिया 16 टाइम्स द एरिया ऑफ द सर्कल विद डायमीटर 7 मीटर ​

Answer 1

Answer:

Area of circle =16 times of diameter

Diameter =1.4m.

Now, Area of circle

=16×1.4

=22.4m

2

Then,

Area of circle=πr

2

πr

2

=22.4

r

2

=

π

22.4

r

2

=

7

22

22.4

r

2

=

22

22.4×7

r

2

=7.12

r=

7.12

r=2.67m

Now, Circumference of circle =2πr

=2×

7

22

×2.67

=2×3.14×2.67

=16.76m.

Hence, this is the answer.