A cube is 21 cm long.Find its total surface area,lateral surface area and volume
Answers
Answer:
the thickness of the plastic sheet, determine:
(i) The area of the sheet required .for snaking the box.
(ii) The cost of sheet for it, if a sheet measuring 1 m2 costs Rs. 20.
Sol: (i) Here, l = 1.5 m, b = 1.25 m
∵ It is open from the top.
∵ Its surface area = [Lateral surface area] + [Base area]
= [2(l + b)h] + [l × b]
= [2(1.50 + 1.25)0.65 m2] + [1.50 × 1.25 m2]
= [2 × 2.75 × 0.65 m2] + [1.875 m2]
= 3.575 m2 + 1.875 m2 = 5.45 m2
∵ The total surface area of the box = 5.45 m2
∴ Area of the sheet required for making the box = 5.45 m2
(ii) Rate of sheet = Rs. 20 per m2
Cost of 5.45 m2 = Rs. 20 × 5.45
⇒ Cost of the required sheet = Rs.109
Q2. The length, breadth and height of a room are 5m, 4m and 3m respectively. Find the cost of white washing the walls of t
Answer:
hope it helps
Step-by-step explanation:
total surface area of cube = 6side²
so = 6 × 21²
= 2646cm²
lateral surface area of cube = 4side²
= 4×21²
= 1764cm²
volume of cube = side³
= 21³
= 9261cm³