Measure it.
A cone with a diameter of 10 and a height of 10 has a volume of 261.8 units3
Half of its diameter
A cone with a diameter of 21.5cm and a height of 33cm has a volume of 3993.55cm3
A cone with a diameter of 16m and a height of 8m has a volume of 536.17m3
Measure it.
That depends what you are given. If you have an actual cone, you can measure the diameter of course.
The radius is half the diameter, so just divide the diameter by 2.
Cannot. If you do not know the angle of the cone, you cannot determine its height.
108.4 square feet
A cone with a diameter of 10 and a height of 10 has a volume of 261.8 units3
Circumference of the cone = 10*pi
The base radius ( or diameter) and the height
Half of its diameter
To approximate the diameter of a speaker cone, find the approximate center. And then stick a ruler across the center of the speaker cone. This will give you the size of the speaker.
The height would be The square root of the square of the slant surface length minus the square of the radius of the cone at the base.
A cone with a diameter of 21.5cm and a height of 33cm has a volume of 3993.55cm3