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Geometrical Figures
Present to
M.Veerasakdi
By: Name Sarun Thienpaitoon
Class: 4/4 No. 12
Geometrical Figures
4-sided figures
Rectangle
All angles are right angles.
Opposite sides are parallel.
Opposite sides are equal.
B
C
AB = CD, AD = BC
AB // CD, AD // BC
A
D
4-sided figures
Square
All angles are right angles.
Opposite sides are parallel.
All sides are equal.
P
S
PQ = QR = RS = PS
Q
R
4-sided figures
Parallelogram
Opposite sides are parallel.
Opposite sides are equal.
K
N
KL = MN,KN = LM
L
M
KL // MN,KN // LM
4-sided figures
Rhombus
Opposite sides are parallel.
All sides are equal.
A
D
AB = BC = CD = AD
AB // CD, BC // AD
B
C
4-sided figures
Trapezium
A trapezium is a four sided closed figure.
It has only one pair of opposite side parallel.
P
S
PS // QR
Q
R
Property of a triangle
B
A
2.5cm
C
Triangle
Side-one
ABC
2.5 cm
Side-two
2.5 cm
Side-two
2.0 cm.
Types of triangles
Right-angled triangle
A triangle with one right angle is called a right-angled
triangle. The right angle is often marked as shown.
Types of triangles
Obtuse-angled triangle
A triangle with one obtuse angle is
called an obtuse-angled triangle.
Types of triangles
Acute-angled triangle
A triangle with all three angles acute is
called an acute-angled triangle.
Types of triangles
Equilateral triangle
A triangle with its three sides equal is
called an equilateral triangle. It also has
three equal angles.
Types of triangles
Isosceles triangle
A triangle with two equal sides is
called an isosceles triangle. It has
two equal angles.
Types of triangles
Scalene triangle
A triangle having all sides of
different length is a scalene triangle.