Geometrical Figures

1
Geometrical Figures

• Present to M.Veerasakdi
• By Suthiti Phatanapherom
• Class 4/7 No. 34

2
Types of Quadrilaterals
parallelogram
rectangle
square
rhombus
Trapezoid(us)
kite
3
Rectangle

• A rectangle is a four-sided shape where every
  angle is a right angle (90).
• Also opposite sides are parallel and of equal
  length.

4
Square

• A square has equal sides and every angle is a
  right angle (90)
• Also opposite sides are parallel

5
Parallelogram

• Opposite sides are parallel and equal in
  length, and opposite angles are equal (angles "a"
  are the same, and angles "b" are the same)

a
b
a
b
6
Rhombus

• A rhombus is a four-sided shape where all sides
  have equal length.
• Also opposite sides are parallel and opposite
  angles are equal.

b
a
a
b
7
TRIANGLES

• There are several different types of triangles.
• You can classify a triangle by its sides and its
  angles.
• There are THREE different classifications for
  triangles based on their sides.
• There are FOUR different classifications for
  triangles based on their angles.

8
Classifying Triangles by Sides

• EQUILATERAL 3 congruent sides
• ISOSCELES at least two sides congruent
• SCALENE no sides congruent

9
Classifying Triangles by Angles

• EQUIANGULAR all angles are congruent
• ACUTE all angles are acute
• RIGHT one right angle
• OBTUSE one obtuse angle

10
Can You Classify the Different Triangles in the
Picture Below?

• Classify the following triangles AED, ABC, ACD,
  ACE

E
A
C
B
D
11
The Classifications

• Triangle AED Equilateral, Equiangular
• Triangle ABC Equilateral, Equiangular
• Triangle ACD Isosceles, Obtuse
• Triangle ACE Scalene, Right
• So how did you do?