r = 1.4 , h = 2.1 then find the curved Surface area and total surface area
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Answer:
Curved surface area = 18.48 cm^218.48cm
2
Total surface area = 30.08 cm^230.08cm
2
Step-by-step explanation:
Given:
r = 1.4 cm
h = 2.1 cm
Now,
Curved surface area = 2πrh
= 2 \times \frac{22}{7} \times 1.4 \times 2.12×
7
22
×1.4×2.1 [\pi = \frac{22}{7} ][π=
7
22
]
= 2 \times 22 \times 0.2 \times 2.12×22×0.2×2.1
= 18.48 cm^218.48cm
2
Total surface area = 2πr(h+r)
= 2 \times \frac{22}{7} \times 1.4 (2.1+1.4)2×
7
22
×1.4(2.1+1.4) [\pi = \frac{22}{7} ][π=
7
22
]
= 2\times 22\times 0.2 \times 3.52×22×0.2×3.5
= 30.08 cm^230.08cm
2
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