Question

13 The height of cylinder is 18 cm and the radius of
the Base is 7cm what is its total surface area?
Ans


a) 792 Sq cm
b)1100 sq cm
c) 1584 sq cm
d] 2200 sq cm​

Answer 1

Answer:

this computer and destroy the original post by apple iPhone app has found the above mentioned position of the day

Answer 2

Question:-

The height of cylinder is 18 cm and the radius of

the Base is 7cm what is its total surface area?

• a) 792 sq cm
• b)1100 sq cm
• c) 1584 sq cm
• d] 2200 sq cm

Required Answer:-

Given:-

• Height of the cylinder is 18cm
• Radius of the base of the cylinder is 7cm

To Find:-

• Total surface area of the cylinder

Solution:-

We know that:-

Total Surface Area =2πrh+2πr^2 sq. units

Where,

• r is radius of the base
• h is height of the cylinder

We were given:-

• h = 18cm
• r = 7cm

Substituting the values:-

=> Total surface area = {2π× 7× 18 +2π× (7)^2}sq.cm

=> Total surface area = {2× 22/7 × 7× 18 +2× 22/7× 49} sq.cm

=> Total surface area = 1100 sq.cm

Hence, the total surface area is b) 1100 sq.cm.

Some Important Formulas:-

• Volume of a cylinder = π(r)^2h cube units

• Total Surface Area of Cylinder = 2πrh+2πr^2 square units

• Curved Surface Area of Cylinder = 2πrh square units.

• Volume of a cone = 1/3π(r)^2 cube units

• Total Surface Area of cone =πrl+π(r)^2 square units

• Curved Surface Area of Cone = πrl square units

• Volume of Cuboid = l×b×h cube units

• Total Surface Area of Cuboid = 2 (lb + bh + hl) square units

• Curved Surface Area of Cuboid = 2h(l +b) square units