直角

90度的角叫直角。

90 dù de jiǎo jiào zhí jiǎo.

An angle of 90 degrees is called a right angle.

直角是九十度。

zhí jiǎo shì jiǔ shí dù.

A right angle has ninety degrees.

这两条线成直角相交。

zhè liǎng tiáo xiàn chéng zhí jiǎo xiāng jiāo.

These two lines cut across each other at right angles.