Question

what is the surface area of the cone used 3.14 as pi his pencil and paper supposed to diameter and the slant height of a cone are cut in half how does this affect the surface area of the cone

Answer 1

EXPLANATION

The area of a cone is given by the following relationship:

$\text{Area}_{\text{cone}}=\pi\cdot r^2+\pi\cdot r\cdot s\text{ where s is the diagonal and r is the radius}$

Replacing terms and using 3.14 as pi:

$\text{Area }=\text{ 3.14}\cdot(5)^2+\pi\cdot5\cdot15$$\text{Area}=\text{ 3.14}\cdot25+75\cdot3.14$

Multiplying terms:

$\text{Area}=78.5+235.5$

Adding numbers:

$\text{Area}=314cm^2$