1. 外心 cricumcentre - perpendicular bisector 垂直平分線的交點 2. 內心 incentre- angle bisector 角平分線的交點3. 垂心 orthocentre- altitude 高的交點4. 形心 centroid - median 中線的交點
#四心dse題目 #4心 #四心program #dse四心題目
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