What is the area of a cylinder is it has a diameter 42cm? (only given diameter)
Answers
Diameter of the base of the cylinder =42 cm
∴ r = radius of the base of the cylinder =21 cm
h = height of the cylinder =10cm
∴ curved surface area of the cylinder = 2πrh
= 2×
7
22
×10cm
2
= 2×22×3×10cm
2
=1320cm
2
total surface area of the cylinder = 2πr(h+r)
= 2×
7
22
×21×(10+21)cm
2
= 2×22×3×31cm
2
=4092 cm
2
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