Question

Find the cost of painting a semi spherical object with radius 2.8cm. If the rate of work of painting is rs 20 per square cm

Answer 1

Answer:

Step-by-step explanation:

Diameter of the hemisphere = 21 cm

Therefore, radius of the hemisphere = 10.5 cm

Volume of the hemisphere =23πr3=23×227×10.5×10.5×10.5=2425.5 cm3

Height of the cylinder =Total height of the vessel-Radius of the hemisphere=14.5-10.5=4 cm

Volume of the cylinder =πr2h=227×10.5×10.5×4=1386 cm3

Total volume =Volume of hemispherical part+Volume of cylinder=1386+2425.5=3811.5 cm3

Answer 2

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CSA OF SPHERE:-2πr²

required surface=2πr²+πr²

= πr²(2+1)

=

$\frac{22}{7} \times 2.8 \times 2.8(3) \times 20 \\ = 304.22$

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