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The circumference of a semicircle is 25.7 cm. How many square centimeters is its area?
The radius of the semicircle is: 25.7 △ 3.14 + 2, = 25.7 △ 5.14, = 5 (CM); so the area of the semicircle is: 3.14 × 52 △ 2 = 39.25 (square cm); answer: its area is 39.25 square cm
What is the circumference and area formula of the circle in Grade 6 of primary school?
Perimeter: diameter x3.14, area: radius square x3.14
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