B2 a flat shape with three straight sides三角形
anything that has three straight sides三角形物
a musical instrument consisting of a thin metal bar bent into a triangle shape that is hit with a metal bar to make a sound三角铁(打击乐器)
US UK set square a flat piece of metal or plastic in the shape of a triangle with one angle of 90°, used for drawing angles(画三角形用的)三角板
also frame a three-sided frame for arranging the balls at the start of a game of billiards, pool, etc.(在台球等比赛开始时摆放球用的)三角板
More examples
Draw a perpendicular from the vertex of the triangle to its base.
A triangle is a shape with three sides.
The cloth was decorated with triangles of different colours.
We cut some triangles of cheese.
To make a star, put two triangles together.
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