triangle

The Bermuda Triangle is a region in the Atlantic where many ships are said to disappear.

(Chinese) 百慕大三角是大西洋上的一个区域，据传有许多船只在那里失踪。

A right-angled triangle must have one internal angle that measures exactly 90 degrees.

(Chinese) 直角三角形必须有一个内角恰好为90度。