Types of triangles (Tipos de triángulos en inglés)

A triangle is a three sided polygon, What are the different types of triangles?

Types of triangles (Tipos de triángulos)

EQUILATERAL TRIANGLE

A triangle with three congruent (equal) sides and three equal angles.

All the sides length (shown by the line through each of them) and all the angles a the same length:

∠ A = ∠ B = ∠ C = 60º

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ISOSCELES TRIANGLE

A triangle with at least two congruent (equal) sides.

Two sides are equal (shown by the lines). Angles opposite the equal sides are equal:

∠ B = ∠ C

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RIGHT TRIANGLE

Has only one right angle (90 degrees).

This is shown by the square block at angle B. The side opposite the right angle in called the hypotenuse:

∠ B = 90º

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SCALENE TRIANGLE

A triangle that has no congruent (equal) sides.

No sides are equal, no angles are equal

A ≠ B ≠ C

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ACUTE-ANGLED

All the angles are less than 90º.

∠ A < 90º, ∠ B < 90º, ∠ C < 90º

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OBTUSE-ANGLED

One of the angles is greater than 90º. The longest side is opposite the larget angle.

∠ A >90º

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