Question

Find the lateral surface area of the figure. A 798 B 210 C 816.8 D 69.7

Answer 1

the lateral surface area of the figure is 660 sq ft

(but the answer is not matching with the options)

Step-by-step explanation: this figure is called cylinder. the lateral surface area means the area of curved surface.

here the diameter is 10 ft

so radius = diameter/2 = 10/2 ft = 5ft

again, height = 21ft

now the lateral surface area = perimeter of the circular surface X height

= 2X pie X r X h ( here r is the radius and h is height and we will take pie as 22/7)

= 2 X (22/7) X 10 X 21 sq ft

= 2 X 22 X 5 X 3 sq ft

=660 sq ft

( suggest you to recheck the options)

Answer 2

Given :-

• Diameter :- 10ft. , radius :- 5ft.
• Height:- 21 ft.

To find :-

• Lateral surface area of Cylinder

Solution:-

• Formula for finding lateral surface area of Cylinder = 2πrh

putting the known values ,

LSA of Cylinder = 2×3.14×5×21 ft²

LSA = 659.4 ft²