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.
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100 cm(2). (2) means squared
The area of rectangle is : 100.0
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.
The formula for the area (A) of a circle is A = πr2. If the area is 100π then 100π = πr2 : 100 = r2 : r = √100 = 10. The radius is of length 10 units.
Well, darling, a park that is 100 yards square has an area of 10,000 square yards. You just multiply the length by the width, honey, and voila! You've got yourself the answer. Now go enjoy that park and bask in the glory of your newfound knowledge.