The volume of a cone is:
where r is base's radius, h is cone's height.
If diameter is 9 in, then radius is 4.5 in and
Answer:
Answer:36 maybe
Step-by-step explanation:
4×3=12
12÷2=6
6×5=30
30+6=36
Answer:
314 m²
Step-by-step explanation:
the formula for the surface area of a sphere (As) is
As = 4×pi×r²
the radius r (half of the diameter) is clearly indicated as 5m.
so, As = 4×3.14×5² = 4×3.14×25
I don't even need a calculator for this, as 4×25 = 100
so, As = 100×3.14 = 314
(you know, when multiplying by 10, the decimal point moves right one position. multiply by 100 it moves 2 positions, and so on).
1. C
2.A
Hope this helps, good luck :D