What is the total surface area of a right circular cone of height 14 cm and base radius 7 cm?
h = 14 cm, r = 7 cm.
So, l =72+142 = 245 = 75cm
Total surface area = πrl+πr2 = 227×7×75 + 227×7×7
=1545+1
= (3.236 x 154) sq.cm
= 498.35 sq.cm
Find the surface area (in cm2) of a sphere of diameter 28 cm.
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