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Grade 5 - Mathematics
7.4 Recognizing the Type of a Triangle

Polygons that have three corners or vertices and three sides or edges which are straight line segments are called Triangles.

Triangles can be classified as:

  1. Equilateral Triangle: A triangles in which all the 3 sides are equal.
  2. Isosceles Triangle: A triangle in which 2 sides are equal.
  3. Scalene Triangle: A triangle in which no side is equal.
  4. Equiangular Triangle: A triangle in which all angles are equal.
  5. Acute angle Triangle: A triangle in which all angles are acute.
  6. Obtuse angle Triangle: A triangle in which one angle is an obtuse angle.
  7. Right angle Triangle: A triangle in which one angle is 90 degrees.
  8. Oblique Triangle: A triangle has only angles that are smaller or larger than 90. It is therefore any triangle that is not a right triangle.

Directions: Answer the following. Draw all the above kinds of triangles and show all the properties.
Q 1: A triangle with all angles acute is called

equiangular triangle
obtuse triangle
acute triangle

Q 2: A triangle with all sides equal is called

an equilateral triangle
isosceles triangle
scalene triangle

Q 3: A triangle with all angles equal is called

acute triangle
obtuse triangle
equiangular triangle

Q 4: Polygons that have 3 sides are called
Triangles
Rectangles
Square

Q 5: A triangle with one angle 90 degrees is called

acute triangle
right triangle
obtuse triangle

Q 6: A triangle with 1 angle obtuse is called

equiangular triangle
obtuse triangle
acute triangle

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Question 8: This question is available to subscribers only!


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