Angle-angle-side congruence. when two triangles have corresponding angles and sides that are congruent as shown below the triangles are congruent .

译：当两个三角形象下面所示有两个角和一个边同时相等时，这两个三角形全等。

youdao

Cutting the cone at various angles gives you various shapes of ellipse. Until the angle of your cut exceeds the angle of the side of the cone.

从侧面不同角度切割圆锥，你便会得到不同的椭圆，直到你的切割角度超过圆锥体侧边的角度。

youdao

So as long as the angle of the cut comes shortof the angle of the cone's side it is an ellipse.

所以，只要你切割的角度达不到圆锥侧边的角度，它依然是椭圆。

youdao

But the visitors really should have been level before the hour when Blackman's cross found Danny Kedwell, only for the Dons' top-scorer to side foot over the bar from the angle of the six-yard box.

BBC: Sammy Moore

Click on through for a side-angle conception.

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The Villa keeper then got lucky when he advanced outside his area and his attempt to chest the ball down fell to Fuller, only for Laursen to cannily fence the Jamaican into a tight shooting angle which saw him fire into the side-netting.

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