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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
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