Triangles like 30,60,90 and 45 45 90 are standard triangles are standard.
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A Reuleaux triangle is a shape that, like a circle, has a constant width. Unlike standard polygons, its sides are outward curves rather than straight lines, the curve a maximum directly across from each vertice.
If a triangle is obtuse, the orthocenter of the triangle actually lies outside of the triangle. If the triangle is acute, the orthocenter of the triangle lies on the inside of the triangle
A triangle can be constructed into any of the given formats.
If a triangle has a right angle, it is a right triangle.
An obtuse angled triangle.