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A square that measures 10cm on each side has an area of 100 square centimeters. This is calculated by multiplying the length of one side by itself (10cm x 10cm = 100 sqcm). The unit for area is always squared, so the area of a 10cm x 10cm square is 100 sqcm.
What is a rectangle were the area is 10 and the perimeter
10mm*10cm = 1cm*10cm = 10 square cm.
100 cm(2). (2) means squared
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.