(iii) (a) Find the total surface area exposed to the surroundings.... | Case-Study 2m | Maths | SuperPadhai

Surface Areas And Volumes > Question

Case-Study2 marksYear: 2023MediumCBSE Class 10

surface-areas-and-volumesspherehemispherecombined

Question

(iii) (a) Find the total surface area exposed to the surroundings.

Solution

1

Radius of ball

= 21

mm.
Total surface area exposed

= 4 π (21)^{2} - 315 \times π (2)^{2} + 315 \times 2 π (2)^{2}

+1 mark

2

= 4 \times \frac{22}{7} \times 21 \times 21 + \frac{22}{7} \times 315 \times 4 = 9504

mm

^{2}

+1 mark

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