The base of a cone is a circle.
The area of a circle is

.
Thus, the area of the base of a cone

.
The derivation of the formula for the area of a circle involves a bit of calculus, but if you'd like, I can walk you through it.
Answer:
Step-by-step explanation:
You first multiply the a with bx and c then after the answer when you multiply you "add" with it would be something like
ex: 6x+4=28
- 4 -4 subtract both sides
------------------------
6x=24 then divide 6 with 24.
x= 3
1/2 (Base x height) = area
1/2 (4*x)=10
2x=10
X=5
The height is 5 units
Answer:
x=1/4
Step-by-step explanation:
Answer:
15/20
Step-by-step explanation:
4 x 5 = 20
so
3 x 5 = 15
so (sorry for the repetition)
= 15/20