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三角形的內心與內切圓
Author:
大園數學
內心是三條角平分線的交點,內心到三個邊的距離相等,此距離即為內切圓的半徑。
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兩位數加法
拼砌四邊形
兩位數除以一位數(二)
【案例】圆柱体内放置一个大球六个小球
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