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Q: How do you work out the perimeter of a non right-angled triangle?

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The perimeter of a triangle is simply the sum of the lengths of its three sides. Knowing that it is right angles (or not) is rarely of help.

First of all, it is clear that a right angled triangle does conform to Pythagoras. So, take any rightangled triangle, and without changing the length of the small sides, slightly reduce the right-angle to something smaller. What was the hypotenuse is now smaller than it was, so its square is now smaller. But the sum of the squares of the other 2 sides hasn't changed. So the Pythagoras result does not work for this new situation.

A right triangle is easy, simply multiply the two sides and divide by two. A non-right triangle is a bit more of a challenge. You have to make it a right triangle by adding a right triangle to it. Calculate and then subtract the area of what you had to add.

A triangle with sides that do not have equal lengths.

right triangle - has one 90Â° angle Pythagorean triangle - right triangle whose side lengths are all integers oblique triangle - has no 90Â° angle acute triangle - each angle is less than 90Â° obtuse triangle - one angle is greater than 90Â° equilateral triangle - angles are 60Â°-60Â°-60Â° isosceles triangle - has two equal angles scalene triangle - has three different angles rational triangle - all side lengths are rational integer triangle - all side lengths are integers Heronian triangle - all side lengths and area are integers equable triangle - has a perimeter of n units and and area of n square units degenerate triangle - angles are 0Â°-0Â°-180Â° planar triangle - a triangle drawn on a flat surface (plane) non-planar triangle - a triangle drawn on a curved surface spherical triangle - a non-planar triangle on a convex surface, like the Bermuda Triangle hyperbolic triangle - a non-planar triangle on a concave surface

what is an non exsample of an perimrter

A non-degenerative triangle has 3 vertices which does not lie on a stright line. i.e the are not collinear

a triangle. . .

Triangles are non-pitched.

A triangle is not necessarily pitched or non-pitched. It is more of an accessory.

Yes. Look up the law of sines and the law of cosines as examples. there are also formulas that can find out the area of a non-right triangle.

Any non-negative number can be a perimeter.

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