The radius is half the diameter. Draw a line that passes through the centre of the circle and measure it. This is the diameter. Halve it and you will have the radius.
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Uisng the lateral area and tha radius, you should be able to find the height of the cone. Using the height and radius as the legs of a right triangle, use the Pythagorean Theorem. The hypotenuse is the slant height.
Find the radius of the circle (if it gives you the diameter just half it to get the radius) and then square it. Then times your answer by pie. So the formula is: A= pie (r squared) P.S. Sorry I couldn't get the mathematical symbols!
Divide the circumference by 2PI to find the radius. ( C = 2PI*Radius)
you double the radius to find the diameter.
squares do not have a radius