In geometry, a sphere is a solid that is absolutely round in shape defined in threedimensional space (XYZ space). Mathematically, a sphere is defined as the set of
points that is at equal distances from a common point in three dimensional space.
Volume of Sphere = 4/3 πr
3
Volume of Hemi sphere = 2/3 πr
3
Surface Area of a Sphere = 4πr
2
Surface Area of a Hemi sphere = 2πr
2
1. Find the surface area of a sphere of radius:
(i) 10.5cm (ii) 5.6cm (iii) 14cm
(Assume π=22/7)
Solution:
Surface area of sphere (SA) = 4πr2
(i) r = 10.5 cm
SA = 4×(22/7)×10.52= 1386
Surface area of sphere is 1386 cm2
(ii) r = 5.6cm
SA = 4×(22/ 7)×5.62= 394.24
Surface area of sphere is 394.24 cm2
(iii) r = 14cm
SA = 4πr2
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Answer:
3rd one im pretty sure mark brainlyest
Explanation:
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