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平面図形(2)

1 不等辺三角形  ?

2 不等辺三角形  ? 

3 直角三角形  ?

4 正三角形 : 各辺の長さの相等しい三角形 [ 広辞苑 ]

equilateral triangle = イークウァタラル ~

( geometry ) a triangle whose three sides are all the same length [ OALD ]

5 正方形 : 四つの辺の長さと四つの内角の大きさがそれぞれすべて相等しい四角形 [ 広辞苑 ]

square スクウェア(スクエアではない)  

( geometry ) a shape with four straight sides of equal length and four angles of 90° [ OALD ]

6 ひし形 : 四辺の長さが互いに相等しい四辺形 [ 広辞苑 ]

rhombus ムバス

( geometry ) a flat shape with four equal sides and four angles which are not 90° [ OALD ]

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