find curved and total surface area of a cylinder when r=7cm,h=12cm
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find curved and total surface area of a cylinder when r=7cm,h=12cm
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S O L U T I O N :
Given :
Explanation :
As we know that formula of curved surface area of cylinder & total surface area of cylinder :
According to the question :
➝ C.S.A of cylinder = 2πrh
➝ C.S.A of cylinder = 2 × 22/7 × 7 × 12
➝ C.S.A of cylinder = 44/7 × 7 × 12
➝ C.S.A of cylinder = (44 × 12)cm²
➝ C.S.A of cylinder = 528 cm²
&
➝ T.S.A of cylinder = πr²h + 2πrh
➝ T.S.A of cylinder = πrh(r + 2)
➝ T.S.A of cylinder = 22/7 × 7 × 12( 7 + 2)
➝ T.S.A of cylinder = 22 × 12(9)
➝ T.S.A of cylinder = 22 × 108
➝ T.S.A of cylinder = 2376 cm²
Answer:
Given :-
To Find :-
Solution :-
As we know CSA of cylinder is 2πrh
[tex] \sf \implies \: CSA = 2 \times \dfrac{22}{7} \times 7 \times 12[/tex]
[tex] \sf \implies CSA = 2 \times 22 \times 1 \times 12[/tex]
[tex] \sf \implies \: CSA = 44 \times 12[/tex]
[tex] \sf \implies \: CSA = 526 \: cm {}^{2} [/tex]
Now,
Let's find TSA of cylinder
TSA of cylinder = πrh (r + 2)
[tex] \sf \implies TSA \: = \dfrac{22}{7} \times 7 \times 12(7 + 2)[/tex]
[tex] \sf \implies \: TSA = \dfrac{22}{7} \times 7 \times 12 \times 9[/tex]
[tex] \sf \implies \: TSA = 22 \times 12 \times 9[/tex]
[tex] \sf \implies \: TSA = 2376 cm^{2}[/tex]