Question

find angle BEC (class 9)​

Answer 1

Answer:

<BEC=<ABE

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Answer 2

Answer:

Given :

Radius of Cylinder is 7 cm.

Height of Cylinder is 4 cm .

To Find :

Curved Surface Area of Cylinder .

Solution :

\longmapsto\tt{Radius=7\:cm}⟼Radius=7cm

\longmapsto\tt{Height=4\:cm}⟼Height=4cm

Using Formula :

\longmapsto\tt\boxed{C.S.A\:of\:Cylinder=2\pi{rh}}⟼

C.S.AofCylinder=2πrh

Putting Values :

\longmapsto\tt{2\times\dfrac{22}{{\not{7}}}\times{{\not{7}}}\times{4}}⟼2×



7

22

×



7×4

\longmapsto\tt{2\times{22}\times{4}}⟼2×22×4

\longmapsto\tt{44\times{4}}⟼44×4

\longmapsto\tt\bf{176\:{cm}^{2}}⟼176cm

2

So , The Curved Surface Area of Cylinder is 176 cm² .

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C.S.A of Cylinder = 2πrh

T.S.A of Cylinder = 2πr(r + h)

Volume of Cylinder = πr²h

Here :

r = radius

h = height

π = 22/7

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