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Objectives: Within the timeframe the students will be able to:
• identify the kinds of triangle;
• name the basic parts of a triangle;
• classify triangles according to its side and angles;
• measures the sides and angles of given triangles;
• cooperate actively in a given task.
What is a line segment?
A line segment is a part of a line consisting two endpoints and all the points between them.
Angle what is it?
An angle is formed by two non collinear rays with a common endpoint.
Acute Angle Right Angle
Obtuse Angle
Vertex
A carpenter cut different triangles with different sizes. He wanted to classify these according to sides and angles and he found difficult in doing it.
Triangles Classified according to SIDES
SCALENE TRIANGLE
E
D
F
No two of its sides are congruent.
ISOSCELES TRIANGLE
G
H
I
At least two of its sides are congruent.
G
H
I
Vertex angle – common
endpoint of two rays
Leg Leg
Base angle Base angle
EQUILATERAL TRIANGLE
J
K
L
All sides are congruent.
Triangles Classified according to ANGLES
ACUTE TRIANGLE
M
N
O
All of its angles are acute.
RIGHT TRIANGLE
P
Q
R
It has one right angle.
Acute Angle
Acute Angle
Hypotenuse- longest side and it is
side opposite the right angle.
Right AngleLeg
Leg
OBTUSE TRIANGLE
S
T
U
One of its angle is obtuse.
EQUIANGULAR TRIANGLE
X
V
W
All of its angles are congruent.