有多少三角形？有四个三角形。

How many triangles are there? There are four triangles.

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下列哪三角形与三角形r的面积相等？

Which of the following has the same area as triangle r.

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给出两个新的三角不等式，并将其应用于讨论角成等比的三角形形状。

In this paper, two new trigonometrical inequalities are given, and applied to discuss triangle shapes.

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终结三角形比引导三角形更常见。

Ending Diagonals are much more common than Leading Diagonals.

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终结三角形比引导三角形更常见。

Ending Diagonals are much more common than Leading Diagonals.

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