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1 It's a 3 sided 2 dimensional polygon

2 It has no diagonals

3 Its largest side is less the sum of its smaller sides

4 Its 3 interior angles add up to 180 degrees

5 Its 3 exterior angles add up to 360 degrees

6 It will tessellate leaving no gaps or overlaps

7 It has a perimeter which is the sum of its 3 sides

8 It has an area which is 0.5*base*perpendicular altitude

9 It can form the base of a tetrahedron pyramid

10 It is the 1st building block of all other polygons

11 It has 3 vertices which is the plural of vertex

12 It's a right angle triangle when it has a 90 degree angle

13 It's an obtuse triangle when it has an obtuse angle and 2 different acute angles

14 It's a scalene triangle when it has 3 different acute angle

15 It's an equilateral triangle when it has 3 equal sides

16 It's an isosceles triangle when it has 2 equal sides

17 It's subject Pythagoras' theorem as a right angle triangle

18 It's subject to the rules of trigonometry

19 Its tangent ratio is: opp/adj as a right angle triangle

20 Its sine ratio is: opp/hyp as a right angle triangle

21 Its cosine ratio is: adj/hyp as a right angle triangle

22 Its hypotenuse squared is equal to the sum of its squared sides as right angle triangle

Q: What are a score or more facts about the properties of a triangle?

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Learning geometry is important because it embraces algebra, trigonometry, Pythagoras' theorem, properties of a triangle, properties of a circle, properties of 2 dimensional and 3 dimensional shapes, coordinated geometry .... and so much much more

The word, trigonometry" is derived from trigon = triangle + metry = measurement. It is based on the study of angles of a triangle and their properties. Although trigonometric ratios are often introduced to students in the context of triangles, their properties for all angles.For example, trigonometric functions are well defined for angles with negative values as well as for more than 180 degrees even though no triangle can possibly have angles with such measures.

A dozen is 12; a score is 20. Thus a score is more than a dozen.

equilateral triangle, isosceles triangle, and theres more but i forgot.

No a pentagon has way more angles than a triangle does.

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I suggest you take a look at the Wikipedia article on "triangle", or at some similar source. I am sure you can find lots of interesting facts there.

there are many properties of triangles more than i could type there are congruence properties similarity properties and trigonometric properties just to name a few if you have a specific one you would like more information about ask

If the system is truly forgotten then nobody will remember even one fact about it - leave alone a score or more!

A square is a special type of rectangle; therefore it has all the properties of a rectangle. Any property that a rectangle has, a square has as well. This includes the facts that it has four right angles (that's where the name "rectangle" comes from), that opposite sides are parallel, that opposite sides have the same length, and that diagonals have the same length.

more than a 90 degree angle but less than a 180 degree angle

Learning geometry is important because it embraces algebra, trigonometry, Pythagoras' theorem, properties of a triangle, properties of a circle, properties of 2 dimensional and 3 dimensional shapes, coordinated geometry .... and so much much more

I can get you started with one: Nobody who knows anything about it calls it "the pi of a circle". Pi is pi.

It is simple the study of triangles: the properties of their sides and angles. This is then extended to other, more complicated polygons and polyhedra, but the basis is still the triangle.

The word, trigonometry" is derived from trigon = triangle + metry = measurement. It is based on the study of angles of a triangle and their properties. Although trigonometric ratios are often introduced to students in the context of triangles, their properties for all angles.For example, trigonometric functions are well defined for angles with negative values as well as for more than 180 degrees even though no triangle can possibly have angles with such measures.

1 It's a 3 sided 2 dimensional shaped polygon 2 It has no diagonals 3 Its largest side is less than the sum of its smaller sides 4 Its 3 interior angles add up to 180 degrees 5 Its 3 exterior angles add up to 360 degrees 6 It will tessellate leaving no gals or overlaps 7 It has a perimeter which is the sum of its 3 sides 8 It has an area which is: 0.5*base*perpendicular altitude 9 It's the 1st building block of all other polygons 10 It can form the base of a 3 dimensional pyramid 11 It has 3 vertices which is the plural of vertex 12 It's a right angle triangle when it has a 90 degree angle 13 It's an obtuse triangle when it has an angle greater than 90 degrees 14 It's a scalene triangle when it has 3 different acute angles 15 It's an equilateral triangle when it has 3 equal 60 degree angles 16 It is an isosceles triangle when it has 2 equal sides 17 It's subject to the rules of trigonometry 18 It's subject to Pythagoras' theorem as a right angle triangle 19 Its tangent ratio is: opp/adj as a right angle triangle 20 It sine ratio is: opp/hyp as a right angle triangle 21 Its cosine ratio is: adj/hyp as a right angle triangle 22 Its hypotenuse squared is equal to the sum of its squared sides as right triangle 23 Its properties were well known by the ancient Greeks and Egyptians 24 It can form the cross-section of a triangular prism 25 It has certain cyclic properties within a circle

twenty = score triangle = 3-sided figure trapezoid = 4-sided figure tangent = touching, but not intersecting, a curve or curved surface. term = each of the quantities in a ratio, series, or mathematical expression.

a more than 3 sided triangle a triangle with more than one obtuse/right angle