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Pythagoras

Q: 1st century greek and Egyptian geometry and engineer whose best known mathematical work is the formula for the area of a triangle in terms of the lengths of its sides?

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In Euclidean plane geometry every triangle MUST BE coplanar.

It means 3 angles that can be found in a triangle.

yes

In normal geometry, it's not possible to make a triangle with two obtuse angles. It is possible to make a triangle with two obtuse angles in spherical geometry -- it's a kind of "spherical triangle". It is possible to make a triangle with two obtuse angles in some kinds of non-Euclidean geometry -- it's a kind of "non-Euclidean triangle".

One example of analogy reasoning in geometry is when you have to figure out what type of triangle a triangle is. For example, if you have a triangle with three sides and you can tell the sides are the same size, you can deduce you have an equilateral triangle, even without measuring it.

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A right triangle in geometry is a triangle that has 90 degrees as one of its angles.

The altitude of a triangle IS a geometric concept so it intersects geometry in its very existence.

There is no anagram for relating in mathematical terms.

In geometry, magnitude is the length of the hypotenuse of a right triangle.

No, never in plane geometry.

Reuleaux triangle

He drew a triangle on his geometry test.

In Euclidean plane geometry every triangle MUST BE coplanar.

It means 3 angles that can be found in a triangle.

The longer sides of a triangle

yes

In normal geometry, it's not possible to make a triangle with two obtuse angles. It is possible to make a triangle with two obtuse angles in spherical geometry -- it's a kind of "spherical triangle". It is possible to make a triangle with two obtuse angles in some kinds of non-Euclidean geometry -- it's a kind of "non-Euclidean triangle".