1

An isosceles triangle has one line of symmetry

2 An isosceles

triangle has no rotational symmetry

3 A triangle can

have either one, two or three lines

of symmetry

4 An triangle can have no lines of

symmetry

5 An triangle can have rotational

symmetry of order 2

6 An right-angled triangle has one line of symmetry

7 The hypotenuse

is always opposite the right angle

8 The sloping side

is the hypotenuse

9 Right-angled

triangles have two equal sides

10 Double the lengths

of the triangle’s sides = double the size of the angles

11 bh A

21

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

12 The area of a

triangle is always greater than its

perimeter

13 6×2×

2

1 A =

2

6

4

14 2×4×

2

1 A =

26

4

15 222 b+ac =

a

c

b

16 71 x sin

x

17 10

17 71 x tan

x17

10

18

ALWAYS

19

SOMETIMES

20

NEVER

21

18

NEVER20

SOMETIMES

1

An isosceles triangle has one line of symmetry

2

An isosceles triangle has no

rotational symmetry

3

A triangle can have either one, two or three lines

of symmetry4

An triangle can have no lines of

symmetry

5

An triangle can have rotational

symmetry of order 2

6

An right-angled triangle has one line of symmetry

7

The hypotenuse is always

opposite the right angle

8

The sloping side is the

hypotenuse

9

Right-angled triangles have

two equal sides

10

Double the lengths of the triangle’s

sides = double the size of the angles

1 1

bh A21

T h e a r e a o f a t r i a n g l e c a n b e f o u n d u s i n g t h e

f o r m u l a .

12

The area of a triangle is always greater than its

perimeter

1 3

6×2×2

1 A =

2

6

4

1 4

2×4×2

1 A =

26

4

1 5

222 b+ac =

a

c

b

1 6

71 x sin

x

1 7 1 0

1 7

71 x tan

x1 7

1 0

18

ALWAYS