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
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!
more than a 90 degree angle but less than a 180 degree angle
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.
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
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.
I can get you started with one: Nobody who knows anything about it calls it "the pi of a circle". Pi is pi.
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.
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
A dozen is 12; a score is 20. Thus a score is more than a dozen.