Question

9. The area of the ring between two concentric circles is 3168 cm - Find the radit of the two
circles if (i) their sum is 42 cm and (1) their difference is 28 cm.
of diameter 28 m is surrounded by a
the path
10. How many plants
of circumference 26.40 m f a space​

Answer 1

Answer:

9. ans. The area of the ring between two concentric circles is 3168 cm - Find the radit of the two

circles if (i) their sum is 42 cm and (1) their difference is 28 cm.

of diameter 28 m is surrounded by a

the path

Step-by-step explanation:

10. ans. Circumference of circle =26.40 m

2πr=26.40

2×

7

22

×r=26.40

r=

2×22

26.40×7

r=4.2 m

Area of circluar garden =πr

2

=

7

22

×4.2

2

=55.44 m

2

Area of each plant =600 cm

2

=6 m

2

No. of plants can planted =

6

55.44

=9.24

≈9