The area of the base of a cone is 616 cm2. If its slant height is 20 cm, then what is the total surface area of the cone? [Use π = 22/7 ]
Show answer & explanation
Correct answer: C
Explanation
The correct answer is option 3 i.e. 1496 cm2.
According to the question,
πr2 = 616
22/7 × r2 = 616
r2 = 196
r = 14
slant height l = 20
Total surface area of cone = πr(r + l)
= 22/7 × 14 (14 + 20)
= 44 × (34)
= 1496 cm2