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The diameter of a semicircle paper is 10 cm, and its circumference is 10 cm______ The area is______ ．
The circumference of the semicircle is: 3.14 × 10 △ 2 + 10 = 15.7 + 10 = 25.7 (CM); the area of the semicircle is: 3.14 × (10 △ 2) 2 △ 2 = 3.14 × 25 △ 2 = 39.25 (CM); answer: the circumference of the semicircle is 25.7 cm, the area is 39.25 square cm. So the answer is: 25.7 cm, 39.25 square cm
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