Types of Triangles
Definitions and formulas for triangles including right triangles, equilateral triangles, isosceles triangles, scalene triangles, obtuse triangles and acute triangles
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| right triangle | equilateral triangle | isosceles triangle |
| obtuse triangle | acute triangle |
| The right triangle: | |
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The right triangle has one 90 degree angle and two acute (< 90 degree) angles. Since the sum of the angles of a triangle is always 180 degrees... y + z = 90 degrees The two sides of the triangle that are by the right angle are called the legs... and the side opposite of the right angle is called the hypotenuse. |
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| The equilateral triangle: | |
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In the equilateral triangle, all the sides are the same length (congruent) and all the angles are the same size (congruent). Since the sum of the angles of a triangle is always 180 degrees, we can figure out the measure of the angles of an equilateral triangle:
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| The isosceles triangle: | |
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The isosceles triangle (I can NEVER remember how to spell isosceles) has two sides that are the same length (congruent) and two angles that are the same size (congruent). |
