A piece of wood is designed in the shape of a cone. A cylindrical hole of radius 4cm and depth 2cm has been drilled into the base.

The surface area of the piece of wood has to be painted, except for the area inside the hole.

Workout the surface area to be painted.

Give your answer in terms of pi.

The surface area of the piece of wood to be painted is:

Step-by-step explanation:

The surface area to be painted is equal to the surface area of the cone minus the cross area of the hole. That is:

Where:

- Radius at the bottom of the cylinder, measured in centimeters.

- Height of the cylinder, measured in centimeters.

- Radius of the cylindrical hole, measured in centimeters.

If , the surface area of the piece of wood to be painted is:

answer: the answer is 40.82

step-by-step explanation: 3.14 x 13(or half of 26) to the power of 2

the sum of the lengths of any two sides of a triangle is greater than the length of the third side. if you take the three sides of a triangle and add them in pairs, the sum is greater than (not equal to) the third side. if that is not true, then it is not possible to construct a triangle with the given side lengths.

step-by-step explanation: