Question

The formula for total surface area of the cylinder is ........

(a) 2πRh

(b) 2πRh+2R

(c) 2πRh+2πR

(d) 2πRh+2πR2

​

Answer 1

Answer:

2πRH I the right answer ok ok

Answer 2

Answer:

D. 2πRh+2πR2

Step-by-step explanation:

he formula for the total surface area of a cylinder is given as:

Total surface area of a cylinder = 2πr2 + 2πrh

TSA = 2πr2 + 2πrh

Where, 2πr2 is the area of the top and bottom circular face and 2πrh is the area of the curved surface.

By taking 2πr as common factor from RHS, we get;

TSA = 2πr (h + r) ……………………………………. (Surface area of a cylinder formula)

Let’s solve example problems involving surface area of a cylinder.

Example 1

Find the total surface area of a cylinder whose radius is 5 cm and height, is 7 cm.

Solution

By the formula,

TSA = 2πr (h + r)

= 2 x 3.14 x 5(7 + 5)

= 31.4 x 12

= 376.8 cm2