You may only use elementary geometry, such as the fact that the angles of a triangle add up to 180 degrees and the basic congruent triangle rules (side-angle-side, etc.).

你可以使用初等的几何知识例如三角形的三个内角各为180度和三角形全等的规则(边-角-边等)。

youdao

Your arms should be at a 90 degree Angle and should be moving forward and back (rotating at the shoulder), not side to side.

您应该肘部弯转90度，双臂前后摆动(旋转，以肩部为中心)，而不是左右摆动。

youdao

Side grip is very important at Sachsenring because the riders spend a lot of time a maximum Angle on the left-hand side, so this is an area we will be looking to strengthen.

在萨赫森灵侧向抓地力十分重要，因为车手会有很长时间向左压把，所以这是我们要强化的地方。

youdao

Suarez, who is so prolific in front of goal for club side Ajax, was to squander further chances: hitting the side-netting from a tight angle from 10 yards and also firing straight at keeper Khune from a promising position 20 yards out.

BBC: South Africa 0-3 Uruguay

Click on through for a side-angle conception.

ENGADGET: Sony Ericsson patents cellphone docking station Mobile

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