Question

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


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


Work out surface area to be painted

Answer 1

Answer:

to find ther surface area of a cone, you use the formula π x r² + π x r x l

Step-by-step explanation:

An in putting the numbers into the variables

r = 4cm

π = 3.14  

So we do π x 4 x 2 + π x r ( there is no length )

and that gives us 25.12 + 12.56 =  37.68cm ( Don't forget the cm!)

hope this helps!