Classification of Triangles

1
ClassificationofTriangles
2
Table of Contents

• Objective
• Review
• Definition of a Triangle
• Samples of Triangular Objects
• Types of angles
• Congruence of Line Segments
• According to Angle Measure
• According to Length of sides
• Review Questions

3
Objective

• At the end of the lesson, the students should be
  able to classify triangles.

4
REVIEW
5
Triangle

• It is a three sided polygon.

A
AC
AB
B
C
BC
6
Samples of Triangles that can be seen around us.
7
TYPES OF ANGLES
8

• Acute Angle

-It is an angle whose measure is less than 900.
B
ltBAC which is an acute angle.
300
A
C
9
Right Angle

• -It is an angle whose measure is equal to 900.

900
10
Obtuse Angle

• - It is an angle whose measure is greater than
  900 but less than 1800.

1500
11
How can we say that two segments are Congruent ?
12

• Two segments are congruent if and only if they
  have equal length.

measure of AB measure of CD
10 cm
A
B
10 cm
C
D
13
CLASSIFICATION OF TRIANGLES

• According to angles
• According to sides

14

15
ACUTE TRIANGLE

• -All the angles of the triangle are acute.

K
ltJ,ltK,ltL are all acute angles.
720
600 48O
J
L
16
RIGHT TRIANGLE

• -An angle in a triangle is a right angle.

N
HYPOTENUSE
The side opposite the right angle of a right
triangle is called the hypotenuse. The other
sides are called legs.
leg
900
M O
leg
ltM is a right angle.
17
OBTUSE TRIANGLE

• - An angle in a triangle is an obtuse angle.

Q
ltP is an obtuse angle.
1280
P
R
18
Triangles According to there sides
19
SCALENE TRIANGLE

• -No two sides are congruent.

B


AB BC CA
4 cm
6 cm
A
C
9 cm
20
ISOSCELES TRIANGLE

• -two sides of the are congruent.

E
The two equal sides of an isosceles triangle are
called legs. The third side is called the base.
leg
leg
D F
base

DE FE
21
EQUILATERAL TRIANGLE

• -Three sides are congruent.

H


GH HI GI
G I
22
THE END!!!
Reported to Salvador Salazar
Mr.
Reported by Jeremy Javier