7. From a solid cylinder whose height is 2.4cm and diameter 1.4cm a co

1.	7. From a solid cylinder whose height is 2.4cm and diameter 1.4cm a conical x cavity of the same height and same diameter is hollowed out. Find the TSA ofsolid to nearest cm?
Answer» ong>Answer: 18 sq.cm. Step-by-step explanation: Height of the cylinder, h = 2.4 m. Diameter of the cylinder, d = 1.4 m. ∴ Radius, r = 0.7 m. (i) Outer CURVED surface area of cylinder = 2πrh =2× 22 × (0.7) ×2.4 7 = 44. × 0.24 = 10.56 cm2 . (II) Area of BASE of = πr2 (iii) Inner surface area of cylinder, = πrl =22 ×0.7×√(0.7)^2 + (2.4)^2 7 =22 × 0.7 ×2.5 7 = 5.5 cm2 ∴ TOTAL surface area of newly formed cube = 10.56 + 1.54 + 5.5 = 17.6 cm2 . ∴ Nearest value is 18 sq.cm.

7. From a solid cylinder whose height is 2.4cm and diameter 1.4cm a conical x cavity of the same height and same diameter is hollowed out. Find the TSA ofsolid to nearest cm?

Answer»

ong>Answer:

18 sq.cm.

Step-by-step explanation:

Height of the cylinder, h = 2.4 m.

Diameter of the cylinder, d = 1.4 m.

∴ Radius, r = 0.7 m.

(i) Outer CURVED surface area of cylinder = 2πrh

=2× 22 × (0.7) ×2.4

= 44. × 0.24 = 10.56 cm2 .

(II) Area of BASE of = πr2

(iii) Inner surface area of cylinder, = πrl

=22 ×0.7×√(0.7)^2 + (2.4)^2

=22 × 0.7 ×2.5

= 5.5 cm2

∴ TOTAL surface area of newly formed cube

= 10.56 + 1.54 + 5.5 = 17.6 cm2 .

∴ Nearest value is 18 sq.cm.

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7. From a solid cylinder whose height is 2.4cm and diameter 1.4cm a conical x cavity of the same height and same diameter is hollowed out. Find the TSA ofsolid to nearest cm?​

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7. From a solid cylinder whose height is 2.4cm and diameter 1.4cm a conical x cavity of the same height and same diameter is hollowed out. Find the TSA ofsolid to nearest cm?