Geometrical Figures

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# Geometrical Figures - PowerPoint PPT Presentation

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.

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Geometrical Figures

Present to M.Veerasakdi

By: Name SarunThienpaitoonClass: 4/4 No. 12

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

KL // MN,KN // LM

L

M

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

R

Q

Property of a triangle

B

2.5cm

2.cm

A

C

2.5cm

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.