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Batoul Wael Shkeir
2015-2016
Grade 5
Outline
Definition of a triangle.
Properties of a triangle.
Kinds of triangles.
Sum of angles in a triangles.
In order to find the definition
of a triangle we must …
Know its
properties.
Know just its
shape.
True False
Properties of a triangle.
 Before we decide exactly what makes a shape a
triangle, we need to know, 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
So that: A triangle is a closed figure with three
sides.
Kinds of triangles(1)
 Click the correct answer.
1. We have …………. Kinds of triangles.
2. ……….. triangles are triangles in which the
measures of all three angles are less than 90
degrees.
five six
Acute Obtuse
Kinds of triangles(2)
1. …………. triangles are triangles in which
the measure of one angle is greater than 90
degrees.
2. Right triangles are triangles in which the
measure of one angle equals ………. degrees.
90 60
ObtuseAcute
Different
Kinds of triangles(3)
 ……….. triangles are triangles in which two of the sides are
the same length.
 Isosceles triangles are triangles in which two of the sides
are the same length.
 Scalene triangles are triangles in which ……….. of the sides
are the same length.
Isosceles Acute
AllNone
Equal
Sum of angles in a triangles

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Triangles

  • 2. Outline Definition of a triangle. Properties of a triangle. Kinds of triangles. Sum of angles in a triangles.
  • 3. In order to find the definition of a triangle we must … Know its properties. Know just its shape.
  • 4. True False Properties of a triangle.  Before we decide exactly what makes a shape a triangle, we need to know, 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 So that: A triangle is a closed figure with three sides.
  • 5. Kinds of triangles(1)  Click the correct answer. 1. We have …………. Kinds of triangles. 2. ……….. triangles are triangles in which the measures of all three angles are less than 90 degrees. five six Acute Obtuse
  • 6. Kinds of triangles(2) 1. …………. triangles are triangles in which the measure of one angle is greater than 90 degrees. 2. Right triangles are triangles in which the measure of one angle equals ………. degrees. 90 60 ObtuseAcute
  • 7. Different Kinds of triangles(3)  ……….. triangles are triangles in which two of the sides are the same length.  Isosceles triangles are triangles in which two of the sides are the same length.  Scalene triangles are triangles in which ……….. of the sides are the same length. Isosceles Acute AllNone Equal
  • 8. Sum of angles in a triangles