Answer:

Step-by-step explanation:
Given that,
Radius of a cone, r = 13 cm
Slant height of the cone, l = 20 cm
We need to find the surface area of the cone. The formula for the surface area of the cone is given by :

Put all the values,

So, the surface area of the cone is
.
Answer:
A= 16
B=?
Step-by-step explanation: srry about the second one im also confused but i tried my best.
In math it means to make a problem easier to work with
The numbers are 18 and 12
Ya pretty much find the decimal form of 1/10 and thats it