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Triangle
1.
2. The Definition of Triangles
C
Triangle is plane figure
which is bordered by three
lines (sides) A
B
Vertex
Vertex :: A, B, C
A, B, C
Side
Side :: AB, AC, BD
AB, AC, BD
11. Based on its Sides and the
Measure of
Interior Angle
12. Right Isosceles Triangle
Right isosceles triangle is a triangle that has
one 90º angle and two equal sides.
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13. Obtuse Isosceles Triangle
Obtuse Isosceles Triangle is a triangle that
has one obtuse angle and two equal sides.
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14. Acute Isosceles Triangle
Acute Isosceles Triangle is a triangle that
has one acute angle and two equal sides.
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15. Obtuse Scalene Triangle
Obtuse Scalene Triangle is a that has one
obtuse angle and no equal sides
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16. Acute Scalene Triangle
Acute Scalene Triangle is a triangle that has
one acute angle and has no equal sides
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17.
18. Equilateral Triangles
All of sides are equal in
length
All of angles are equal in C
measure
Can fill its frame in 6 ways
The sum of all angles is
B
180º
Has three axes of symmetry
180º
19. Isosceles
Has two equal sides
Can fill its frame in 2
ways
All of its angles are acute
angle
Has a pair of same angle
Has an axis of symmetry
20. Right Triangle
Has a right angle
Has 2 acute angles
Can fill its frame in a
way
We can form some
plane figures such
as...
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23. Angle in Triangle
Exterior angle is formed by
Exterior angle is formed by
The measure of an one side and the extension
one side and the extension
exterior angle of a of another side of angle
of another side of angle
triangle is equal to
the sum of two
interior angles which Exterior Angle
are not
supplementary to the
exterior angle.
Interior Angle
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24. Perimeter of Triangle
Sum of all the sides in triangle
Example C
10 cm + 6 cm + 8 cm
= 24 cm
8 cm 10 cm
A B
6 cm
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25. Area of Triangle
A
= 108 cm : 2 cm = 54 cm2 12 cm 15 cm
B C
9 cm