simple power point about triangles.It can be used for special educational students as a summary or as an evaluation.

1. Triangles
BATOUL WAEL SHKEIR
2015-2016
GRADE 5

2. Outline
Definition of a triangle.
Properties of a triangle.
Kinds of triangles.
Sum of angles in a triangles.

3. Definition of a triangle(1)
In order to find the definition of a
triangle we must …
Know its
properties.
Know just its
shape.

4. A triangle is a closed figure
with three sides.
Definition of a triangle(2)

5. True False
Properties of a triangle
What a closed figure is ?
A figure is closed
if all its sides are
connected
A figure is closed
if all its sides are
not connected

6. Kinds of triangles(1)
Click the correct answer.
1. We have …………. Kinds of triangles.
five six

7. Kinds of triangles(2)
a) Acute triangles
^
CAB = 78°
^
BCA = 34 °
^
CBA = 68°

8. Greater than Less than
Acute triangles are triangles in
which the measures of all three
angles are ………… 90 degrees.

9. Kinds of triangles(3)
b) Obtuse triangles
^
CAB =121°
^
BCA = 19º
^
ABC = 40º

10. Obtuse triangles are triangles in
which the measure of one angle
is …………… 90 degrees.
Less than Greater than

11. Kinds of triangles(4)
c) Right triangles
^
CAB = 73 °
^
ABC = 90 °
^
BCA = 17 °

12. Right triangles are triangles in which
the measure of one angle equals
………. degrees.
90 60

13. Kinds of triangles(5)
d) Isosceles triangles
BA = 2 cm
^
BCA= 55 °
AC = 2 cm
^
CBA = 55°

14. Isosceles triangles are triangles in
which two of the sides are the
……….. length.
Different Equal

15. Kinds of triangles(4)
e) Equilateral triangles
CA = 2 cm
BA = 2 cm
BC = 2 cm

16. Equilateral triangles are triangles in
which ……….. of the sides are the
same length.
NoneAll

17. Kinds of triangles(6)
f ) Scalene triangles
BA = 2 cm
CA = 3 cm
BC = 4.5 cm

18. NoneAll
Scalene triangles are triangles in which
……. Of the sides are equal.

19. Obtuse
triangle
Acute
triangle
Match
^
CAB =121°
^
BCA = 19º
^
ABC = 40º
^
CAB = 78°
^
BCA = 34 °
^
CBA = 68°

20. 121
40
+ 19
Sum of angles in a triangles (1)
Obtuse triangle
180
^
CAB =121°
^
BCA = 19º
^
ABC = 40º

21. Sum of angles in a
triangles (2)
Acute triangle
78
68
+ 34
180
^
CAB = 78°
^
BCA = 34 °
^
CBA = 68°

22. Sum of angles in
any triangle is
……. degrees
180So that
Sum of angles in a triangles (3)

23. Thanks for your
attention