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直角三角形

noun

a right-angled triangle

Please calculate the area of this right-angled triangle.

三角形

noun

a triangle (polygon)

鋭角三角形

noun

acute triangle (triangle all of the angles of which are acute)

鈍角三角形

noun

obtuse triangle

十三角形

noun

a tridecagon

三角関数

noun

(trigonometry) a trigonometric function

Trigonometric functions are one of the basic concepts in mathematics.

冬の大三角形

name

(uranography) Winter Triangle - a bright asterism of the northern winter sky. Its corners are the stars Betelgeuse, Procyon, and Sirius.

The Winter Triangle is a shape that connects the brightest stars in the night sky.

夏の大三角形

name

(uranography) Summer Triangle - a bright asterism of the northern summer sky. Its corners are the stars Altair, Deneb, and Vega.

対辺

noun

(geometry) opposite side

In this triangle, we can see that the opposite sides are equal.

半径

ひらがな
はんけい
noun

(geometry) radius

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