Question

a cylindrical 70mm long has a 14mm diameter . find its curved surface area
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Answer 1

ANSWER:

• Required Curved surface area of Cylinder = 3080 mm² or 30.80 cm²

GIVEN:

• Height of Cylinder = 70 mm.
• Diameter of Cylinder = 14 mm.

TO FIND:

• Curved surface area of Cylinder.

FORMULA USED:

• Curved surface area of Cylinder = 2πrh.

SOLUTION:

Height of Cylinder = 70mm

Radius = Diameter /2

=> Radius (r) = 14/2

=> Radius (r) = 7 mm

Putting the values in the formula:

Curved surface area :

$= 2 \times \dfrac{22}{7} \times 7 \times 70 \\ \\ = 44 \times 70 \\ = 3080 \: mm {}^{2}$

Required Curved surface area of Cylinder = 3080 mm² or 30.80 cm²

NOTE:

Some important formulas:

Area of Square = (Side)²

Area of rectangle = Length*Breadth

Area of rhombus = Base*Altitude

Area of parallelogram = Base*Altitude

Area of Triangle = (Base*Altitude)/2

Perimeter of Square = 4(side)

Perimeter of rectangle = 2(length+breadth)

Volume of cylinder = πr²h

Curved surface area of Cylinder = 2πrh

Where

r = radius

h = height

Answer 2

Answer:

3080mm

Step-by-step explanation:

Given that

A Cylindrical is 70mm long (hight)

Diameter is 14mm

Diameter = 14mm/2

radius = 7mm

curved surface area of cylinder = 2πrh

= 2❌ π ❌ 7 ❌ 70

= 44❌ 70

= 3080 mm^