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Why do you square the radius when finding the area of a circle?
Whether you are finding the area of a circle or the area of a square or any other geometrical shape, it is always the case that to go from a linear measurement (a radius, a side, or whatever) to a surface area requires you to use a square of the linear measurement; you are increasing size in two dimensions, length and width, and therefore the effect is the increase the area exponentially, not linearly.
What is the formula for finding the area of a semi circle in terms of pi?
Well the formula for a full circle is 3.14xradius squared So cut the radius in half then square it the multiple by 3.14
How do you find the area of a semi-circle radius 10cm?
πr² is the formula for finding the area of a circle. To find the area of a semicircle just divide the answer by two. So take the radius, square it, which in this case would be 100, multiply it by π [pi (3.14)] and divide it by two.
How do you get an area for a circle?
Area of a circle = Pi * radius2
If the radius of a circle is doubled what happens to the area of the circle?
the area of the circle is increased by 400%
