freeCodeCamp/guide/english/mathematics/special-right-triangles-intro/index.md

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Special Right Triangles Intro

Special Right Triangles Intro

Special right triangles are a type of right triangle where the two non-right angles share a special relationship.

There are two types of special right triangles: a 45-45-90, and a 30-60-90.

45-45-90

This type of triangle has one angle of 90^o, and two angles of 45^o each. This causes the triangle's sides to have this special relationship:

30-60-90

This type of triangle has one angle of 90^o, one angle of 60^o, and one angle of 30^o. This causes the triangle's sides to have this special relationship: