Geometrical Figures

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Geometrical Figures

• Present to M.Veerasakdi

By Name Sarun Thienpaitoon Class 4/4 No. 12
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Geometrical Figures
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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
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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
5
4-sided figures

• Parallelogram
• Opposite sides are parallel.
• Opposite sides are equal.

K
N
KL MN,KN LM KL // MN,KN // LM
L
M
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4-sided figures

• Rhombus
• Opposite sides are parallel.
• All sides are equal.

A
D
AB BC CD AD AB // CD, BC // AD
B
C
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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
R
Q
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Property of a triangle
B
2.5cm
2.cm
A
C
2.5cm
Triangle Side-one Side-two Side-two
ABC 2.5 cm 2.5 cm 2.0 cm.
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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.

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Types of triangles

• Obtuse-angled triangle
• A triangle with one obtuse angle is
• called an obtuse-angled triangle.

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Types of triangles

• Acute-angled triangle
• A triangle with all three angles acute is
• called an acute-angled triangle.

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Types of triangles

• Equilateral triangle
• A triangle with its three sides equal is
• called an equilateral triangle. It also has
• three equal angles.

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Types of triangles

• Isosceles triangle
• A triangle with two equal sides is
• called an isosceles triangle. It has
• two equal angles.

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Types of triangles

• Scalene triangle
• A triangle having all sides of
• different length is a scalene triangle.