Question

find the total surface area of a right circular cylinder whose base has radius 7 cm and height 8 cm​

Answer 1

Solution:

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To find:

The total surface area of a right circular cylinder.

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Radius of base= 7cm

Height= 8cm

Total surface area= 2πr(height+radius)

2×22/7×7(7+8)

2×22/7×7×15

660cm²

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Some important formulae:

• Perimeter of square= 4×side
• Perimeter of rectangle= 2×(l+b)
• Area of square= s×s
• Area of rectangle= l×b
• Length of rectangle= Area/Breadth
• Breadth of a rectangle= Area/Length
• Side of a square= √Area
• Area of a parallelogram= Base×Height
• Area of a triangle= 1/2×b×h
• Area of an equilateral triangle=

√3a²/4

• Area of a trapezium= 1/2×height×sum of parallel sides

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Answer 2

Answer:

To find:

The total surface area of a right circular cylinder.

________________________________

Radius of base= 7cm

Height= 8cm

Total surface area= 2πr(height+radius)

2×22/7×7(7+8)

2×22/7×7×15

660cm²

________________________________

Some important formulae:

Perimeter of square= 4×side

Perimeter of rectangle= 2×(l+b)

Area of square= s×s

Area of rectangle= l×b

Length of rectangle= Area/Breadth

Breadth of a rectangle= Area/Length

Side of a square= √Area

Area of a parallelogram= Base×Height

Area of a triangle= 1/2×b×h

Area of an equilateral triangle=

√3a²/4

Area of a trapezium= 1/2×height×sum of parallel sides

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Step-by-step explanation: