INTRODUCTION TO TRIANGLES
Presentation
•
Mathematics
•
9th Grade
•
Practice Problem
•
Medium
Binita Bora
Used 5+ times
FREE Resource
6 Slides • 7 Questions
1
Triangles
(Congruency)
By Binita Bora
2
Scalene Triangle: All the side are unequal.
Isosceles Triangles: Any two sides are equal.
Equilateral Triangle: All the sides are equal.(all the angles of 60 degrees).
On the basis of Sides
Acute Angled Triangle : All the angles are acute(<90 degrees)
Right Angled triangle: One of the angle is right angle (=90 degrees).
Obtuse Angled Triangle: One of the angle is obtuse (>90 degrees).
On the basis of Angles
Types of triangles
3
Multiple Choice
Which set of the triangles are isosceles?
A, B, C
A, D, E, F
A, D, F, G
A,F, H, G
4
Congruency
Two or mores shapes are congruent if they have the same size and shape.
5
Multiple Select
Select the congruent shapes.
P
Q
R
S
M
6
Congruency of Triangles
Two triangles are called congruent if its all corresponding sides and angles are equal.
7
Multiple Choice
What is the symbol of congruency of two triangles ?
≡
≅
≈
∼
8
Multiple Choice
If ΔIOP ≅ΔQWE, then
∠Q=∠P
∠W=∠O
∠E=∠I
∠Q=∠I
∠W=∠O
∠E=∠P
∠Q=∠O
∠W=∠P
∠E=∠I
9
Multiple Select
Select the pairs of congruent triangles.
A ≅ B
F ≅ D
H ≅ C
G ≅ A
E ≅ C
10
Poll
If all the dimensions of triangles are not given, Can we still know which of them are congruent?
Yes
NO
Yes, with some conditions.
11
Criteria for congruency
SSS: Side-Side-Side
SAS : Side-Angle-Side
ASA : Angle-Side-Angle
AAS : Angle-Angle-Side
RHS : Right angle-Hypotenuse-Side
12
13
Multiple Choice
If the two triangles are congruent by SSS. Does that mean, their corresponding angles are also congruent (equal)?
Yes
No
Triangles
(Congruency)
By Binita Bora
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