The lateral surface area and the slant height of a cone are 1884.4 m2�

1.	The lateral surface area and the slant height of a cone are 1884.4 m2 and 12 m respectively. Find its base radius.
Answer» Given, Slant height of cone (l) = 12 meter Lateral surface area = 1884.4 m² Let the radius of base be r. ∴ πrl = 1884.4 \(\frac { 2112 }{ 7 }\) × 12 × r = 1884.4 r = \(\frac { 1884.4\times 7 }{ 22\times 12 }\) = 50 m(approx)

The lateral surface area and the slant height of a cone are 1884.4 m2 and 12 m respectively. Find its base radius.

Answer»

Given,

Slant height of cone (l) = 12 meter

Lateral surface area = 1884.4 m²

Let the radius of base be r.

∴ πrl = 1884.4

\(\frac { 2112 }{ 7 }\) × 12 × r = 1884.4

r = \(\frac { 1884.4\times 7 }{ 22\times 12 }\)

= 50 m(approx)