1. 1 An isosceles triangle has one line of symmetry

2. 2 An isosceles triangle has no rotational symmetry

3. 3 A triangle can have either one, two or three lines of symmetry

4. 4 An triangle can have no lines of symmetry

5. 5 An triangle can have rotational symmetry of order 2

6. 6 An right-angled triangle has one line of symmetry

7. 7 The hypotenuse is always opposite the right angle

8. 8 The sloping side is the hypotenuse

9. 9 Right-angled triangles have two equal sides

10. 10 Double the lengths of the triangle’s sides = double the size of the angles

11. 11 The area of a triangle can be found using the formula.

12. 12 The area of a triangle is always greater than its perimeter

13. 13 2 6 4

14. 14 2 6 4

15. 15 a c b

16. 16 x 17 10

17. 17 x 10

18. 18 ALWAYS

19. 19 SOMETIMES

20. 20 NEVE R

21. 21