1.一块0.25公顷的棉田成三角形,量得它的底是125米.它的高是多少米?(写出过程)一个圆和一个扇形的半径相等.已知圆的面积是30平方厘米,扇形的圆心角是72度,求扇形面积.
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![1.一块0.25公顷的棉田成三角形,量得它的底是125米.它的高是多少米?(写出过程)一个圆和一个扇形的半径相等.已知圆的面积是30平方厘米,扇形的圆心角是72度,求扇形面积.](/uploads/image/z/5030952-24-2.jpg?t=1.%E4%B8%80%E5%9D%970.25%E5%85%AC%E9%A1%B7%E7%9A%84%E6%A3%89%E7%94%B0%E6%88%90%E4%B8%89%E8%A7%92%E5%BD%A2%2C%E9%87%8F%E5%BE%97%E5%AE%83%E7%9A%84%E5%BA%95%E6%98%AF125%E7%B1%B3.%E5%AE%83%E7%9A%84%E9%AB%98%E6%98%AF%E5%A4%9A%E5%B0%91%E7%B1%B3%3F%28%E5%86%99%E5%87%BA%E8%BF%87%E7%A8%8B%29%E4%B8%80%E4%B8%AA%E5%9C%86%E5%92%8C%E4%B8%80%E4%B8%AA%E6%89%87%E5%BD%A2%E7%9A%84%E5%8D%8A%E5%BE%84%E7%9B%B8%E7%AD%89.%E5%B7%B2%E7%9F%A5%E5%9C%86%E7%9A%84%E9%9D%A2%E7%A7%AF%E6%98%AF30%E5%B9%B3%E6%96%B9%E5%8E%98%E7%B1%B3%2C%E6%89%87%E5%BD%A2%E7%9A%84%E5%9C%86%E5%BF%83%E8%A7%92%E6%98%AF72%E5%BA%A6%2C%E6%B1%82%E6%89%87%E5%BD%A2%E9%9D%A2%E7%A7%AF.)
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