鈍どん角かく三さん角かく形けい

ど

ん

か

く

さ

ん

か

く

け

い

Meanings

1

noun

obtuse triangle

A triangle with one interior angle greater than 90 degrees.

dull, slow, foolish

角angle, corner, square

三three

形shape, form, style

鋭えい角かく三さん角かく形けい
An acute triangle has all angles less than 90 degrees, while an obtuse triangle has one angle greater than 90 degrees.
直ちょっ角かく三さん角かく形けい
A right triangle has one 90-degree angle, whereas an obtuse triangle has an angle greater than 90 degrees.

Compound of 鈍角 (obtuse angle) + 三角形 (triangle).