Question

(i) The area of a circle of radius 28 cm is:(a) 2464 cm2

(b) 352 cm2

(c) 4928 cm2

(d) 2700 cm2

(ii) The Curved surface area of a hemisphere of radius 28 cm is:
(a) 9856 cm2

(b) 19800 cm2

(c) 4928 cm2

(d) 79200 cm2
(iii) The Curved surface area of a cylinder of radius 28 cm and height 200 cm is
(a) 19140 cm2

(b) 35200 cm2

(c) 59700 cm2

(d) 382800 cm2
(iv) Help him to calculate the total square metres of surface area he needs:
(a) 6.08 m2

(b) 7 m2

(c) 5 m2

(d) 4.01 m2
(v) Find the cost of polishing, Mayank has to bear if 1 m2 area of polish cost Rs 200.
(a) Rs 1400 (b) Rs. 802 (c) Rs. 1000 (d) Rs. 1216

Answer 1

Answer:

1. 2 πr² = 2461.76cm²

2. 2πr² = 4923.52cm²

3. 2πrh= 35168

4. but which shape

5.