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They are as follows:-
1 Triangles are 2 dimensional polygon shapes
2 Triangles have 3 sides
3 Triangles may have acute angles greater than 0 but less than 90 degrees
4 Triangles may have right angles which are 90 degrees
5 Triangles may have obtuse angles greater than 90 but less than 180 degrees
6 Triangles have 3 interior angles that add up to 180 degrees
7 Triangles have 3 exterior angles that add up to 360 degrees
8 Triangles can be scalene which have 3 acute angles
9 Triangles can be right angled with a 90 degree angle and 2 acute angles
10 Triangles can be obtuse with 1 obtuse angle and 2 acute angles
11 Triangles can be isosceles with 2 equal angles and another angle
12 Triangles can be equilateral with 3 equal angles of 60 degrees
13 Triangles have no diagonals
14 Triangles will tessellate
15 Triangles have lines of symmetry when they are isosceles or equilateral
16 Triangles have perimeters which is the sum of their 3 sides
17 Triangles have areas which is 0.5*base*altitude
18 Triangles can be used with Pythagoras' theorem if they are right angled
19 Triangles can be used in conjunction with trigonometry
20 Triangles are found in all other polygons
21 Triangles and their properties were known by the ancient Greeks
22 Triangles can be made into Musical Instruments
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∙ 10y ago
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