three four five rule

DA triangle with one90° angle is a right triangle.

一个角为90°的三角形是直角三角形。

The hypotenuse is the longest side of a right triangle.

直角三角形的斜边是直角三角形中最长的边。

the side of a right triangle opposite the right angle.

直角三角形的相对于直角的边。

The trigonometric functions are defined for right triangles.

三角函数是对直角三角形定义的。

The reciprocal of the tangent of an angle in a right triangle.

余切直角三角形中角的正切的倒数

The reciprocal of the sine of an angle in a right triangle.

余割直角三角形中一个角正弦的倒数

A right triangle is formed by lines joining points SPQ.

SPQ三点联结后即构成一个直角三角形。

the longer (or long) edge of the door; the hypotenuse is the longest (or long) side of a right triangle.

较长的（或长的）门边；直角三角形的斜边是直角三角形中最长（或长的）。

This law is true of any right triangles.

这个定律适用于任何直角三角形。

To measure by using trigonometry.

用平面直角三角形计算工具测量

function of an angle expressed as a ratio of the sides of right-angled triangle containing the angle.

直角三角形各角的函数是用各边的比来表示的。

ratio of the opposite side to the hypotenuse.

直角三角形的一个角的对边与斜边之比。

ratio of the hypotenuse to the opposite side.

直角三角形的斜边与一个角的对边之比。

ratio of the hypotenuse to the adjacent side.

直角三角形的斜边与一个角的邻边之比。

ratio of the opposite to the adjacent side.

直角三角形的一个角的对边与邻边之比。

ratio of the adjacent side to the hypotenuse.

直角三角形的一个角的邻边与斜边之比。

ratio of the adjacent to the opposite side.

直角三角形的一个角的邻边与对边之比。

Research of space angles by graphic method

广义直角三角形法图解空间角度问题研究