Right-angled triangle

/ɹˈaɪtˈaŋɡəld tɹˈaɪaŋɡəl/

/ɹˈaɪtˈæŋɡəld tɹˈaɪæŋɡəl/

a flat geometric shape consisting of three straight sides and one right angle

Example

An acute angle in a right-angled triangle is an example of an oblique angle.

The hypotenuse is the longest side in a right-angled triangle, opposite the right angle.

In trigonometry, the sine function (sin) relates the ratio of the length of the opposite side to the hypotenuse in a right-angled triangle.

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