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1 Its area is 0.5*side2*sin(60)

2 Its area is also 0.5*base*altitude

3 It's normally known as an equilateral triangle

4 It has 3 equal interior angles of 60 degrees

5 Its equal exterior angles add up to 360 degrees

6 It has no diagonals

7 Its perimeter is the sum of its 3 sides

8 It has 3 lines of symmetry

9 It has rotational symmetry to the order of 3

10 It will tessellate leaving no gaps or overlaps

11 It can be doubled up into a 4 sided quadrilateral

12 It fits perfectly into a circle

13 It can be halved into 2 right angle triangles

14 It's a 2 dimensional shape

15 It belongs to the class of polygons known as triangles

16 It can be subjected to Pythagoras' theorem

17 It's subjected to trigonometry

18 Its properties were known by the ancient Greeks

19 It can form the cross-section of a prism

20 It and its friends can be congruent or similar

21 It can with friends change into a 3 dimensional tetrahedron

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