Question

a circular pond has radius 70m a 7m wide footpathruns around it fine the are of footpath

Answer 1

I AM SORRY I. NOT CLEAR WITH THE QUESTION
SO ILL TELL THE CIRCUMFERENCE
$2\pi \: r = 2 \times 22 \div 7 \times 70.07$

there fore the answer is 4400m^2

Answer 2

Answer:

GIVEN :-

• Radius of circular pond ( r ) = 70 m.
• Width of footpath ( w ) = 7 m.

TO FIND :-

• The area of footpath.

SOLUTION :-

Let the radius of circular pond be "r" and the radius of outer circle ( bigger circle ) be "R".

➳ R = r + w

➳ R = 70m + 7m

➳ R = 77m.

Now,

➳ Area of footpath = πR² - πr²

➳ Area of footpath = 22/7 × (77)² - 22/7 × (70)²

➳ Area of footpath = 22 × 77 × 11 - 22 × 70 × 10

➳ Area of footpath = 18634 - 1690

➳ Area of footpath = 1694 m²

Now,

➳ Total cost of levelling = Area × Rate

➳ Total cost of levelling = 1694 × 15

➳ Total cost of levelling = Rs. 25410

Hence Total cost of levelling the footpath = Rs. 25410.