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it's a semi-sphere circle is to semi-circle as sphere is to semi-sphere
No, there is no polygon with 7 or more sides can tessellate.
Semi-circle.
Well, darling, a semicircle is half of a circle, so to find the area you just take the area of a full circle and divide it by 2. The formula for the area of a circle is πr^2, so for a 10cm semicircle, you'd calculate it as 0.5 * π * 5^2, which gives you an area of 39.27 square centimeters. Voilà!
180 degrees a half of a revolution is a semi circle protractor