Question

1 Find the circumference of the circle with radius 21 cm (Take π = 22/7)

2. Find the area of the circle with radius 5 cm. (Take π = 22/7)

3. Find the perimeter of the figure, which is a semicircle including its diameter.

4. A3 m wide path runs outside and around a rectangular park of length 125 m and breadth 65 m.

Find the area of the path.

5. Apath 1 m wide is built along the border and inside a square garden of side 30 m. Find:

(i) the area of the path

(ii) the cost of planting grass in the remaining portion of the garden at the rate of ₹ 40 per m2.​

Answer 1

Answer:

1)Ans :132cm

Step-by-step explanation:

1. Radius of circle(r)=21cm

Circumference of the circle =2πr

= 2 x 22/7 x 21

= 2 x 22 x 3

=2x 66

= 132 cm

Circumference of the circle is 132 cm

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Answer 2

Step-by-step explanation:

1. circumference =2PI r

=2×22/7×21

=132

2. area= PI r square

=22/7×5^2

=78.571

3. area of circle = 2 pi r

therefore, area of semicircle = 1/2×2PI r

= PI r