Question

A table lamp is in the form of a frustum of a cone whose area of the top and bottom circle bases are 212 and 103 $m^2$. Find the total surface area, if slant height is 10 m and top and bottom radii are 2 and 4 m ( Use $\pi$ = 3)

• A. 595 $m^2$
• B. 550 $m^2$
• C. 510 $m^2$
• D. 505 $m^2$

Answer 1

Answer: (A)

595 $m^2$

Total surface area = $\pi (R+r)s+\pi R^2+\pi r^2$
$=\pi (4+2)\times 10+212+103$
$=3\times 6\times 10\times 415$
$=180+415$
$=595m^2$