If you put the two triangles together, you can get a rectangle.
如果把这两个三角形拼到一起，可以得到一个长方形。
Draw a diagonal line to divide the square into two triangles.
画一条对角线，把正方形分成两个三角形。
Two triangles are called similar if they have the same angles (same shape).
若两三角形三内角对应相等,则两三角形相似.(相同形状).
Two possible triangles are shown.
上图显示了两个可能三角形。
Butterfly Mechanism consists of two congruent equilateral triangles.
蝶形单元是由两个全等的三角形组成。
Butterfly Mechanism consists of two congruent equilateral triangles.
蝶形单元是由两个全等的三角形组成。
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