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hello and welcome to this dot frost mask key skill video on finding the area of a simple fraction of a circle now in the previous video we saw how we could find the full area of a circle and if we had the radius of the circle remember the radius was the distance from the center of the circle to the edge of the circle known as the circumference then the area was equal to pi multiplied by the radius squared and remember by bitmus this means pi times r squared so we square the radius first and then multiply it by pi it doesnamp;#39;t mean pi times the radius and then squaring that whole thing there thatamp;#39;s not what it means now what we need to do is to think of well what fraction of a circle have we got here well this appears to be a semi-circle which is half a circle so all we need to do is to find the area of a full circle and then half it to get half of the area of the circle so letamp;#39;s do that so the full circle for a would be pi multiplied by the radius squared well loo