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how to find the area of a half circle. If you know the formula for a circle is area equals pi times the radius squared or pi r squared then you know the formula for a semi-circle because a semi-circle is just half of a circle so all you have to do is take our area of a circle formula and then divide it by 2. See Area of a Circular Segment given the Segment Height.
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Remember that the diameter is equal to double the radius. Therefore whatever value you are given for the diameter cut it in half and you will have the radius. So the formula for the area of a semicircle is A pi r22.
Since youre finding the area of a semi-circle youll be looking for half of the area of a circle which means you have to use the formula for finding the area of a semi-circle and then divide it by two.
The radius of the circle is half of its diameter. See Area of a Circular Segment given the Segment Height. The diameter of the circle is the same as the width of the rectangle in the case of this rink and half of that is. In this version the central angle must.
