The total surface area of cone of slant height 9m and radius of base 12 m is:
(a)396sq cm
(b)198sq cm
(c) 792sq cm
(d) 264sq cm
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Answer:
Total surface area of cone = 792 m²
Step-by-step explanation:
It is given that the height of the cone is 9 m and its radius is 12 m.
We have to find the total surface area of cone.
Formula is:
Total surface of cone = πr (r + L) sq. units
Here r = radius of the circular base of the cone
L= slant height of the cone.
π = 22/7
We know that, r = 12 m and L = 9 m
Put the values in above equation.
Total surface area of cone = πr (r + L)
= [(22/7) × 12] (12 + 9)
= (22/7) × 12 × 21 = 22 × 12 × 3
= 792 m²
Total surface area of cone = 792 m²
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