Acute Triangle

A right triangle can be isosceles if the two legs are equal in length. A right isosceles triangle will have a 90º angle and two 45º angles. A right triangle can not be equilateral because the hypotenuse must always be longer than the legs. Acute Triangles. An acute triangle is a triangle whose angles are all acute (i.e. less than 90°).

source:
onlinemathlearning.com

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demonstrations.wolfram.com

Equilateral Triangle

Equilateral Triangle . Three equal sides Three equal angles, always 60° ... Interactive Triangles Right Angled triangles Proof that a Triangle has 180 ...

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mathsisfun.com

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commons.wikimedia.org

Isosceles Triangle

There are three special names given to triangles that tell how many sides (or angles) ... Right Isosceles Triangle . Has a right angle (90°), and ...

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mathsisfun.com

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en.m.wikipedia.org

Obtuse Triangle

Since a triangle's angles must sum to 180°, no triangle can have more than one obtuse angle. Acute and obtuse triangles are the two different types of oblique triangles—triangles that are not right triangles because they have no 90° angle.

source:
en.wikipedia.org

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en.wikipedia.org

Scalene Triangle

There are three special names given to triangles that tell how many sides ... Scalene Triangle . ... Right Triangle . Has a right angle ...

source:
mathsisfun.com

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quia.com