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Grade 6 - Mathematics
9.19 Classifying Triangles by Angles
Classification of triangles based on angles
Acute angled triangle:
If all the angles of a triangle are acute angles, then it is called an
acute angled triangle
Right angled triangle:
A triangle in which one of the angles is a right angle is called a
right angled triangle
In a right angled triangle, the side opposite to the right angle is called its
Obtuse angled triangle:
A triangle containing an obtuse angle is called an
obtuse angled triangle
Read the above properties of triangles and answer the following questions:
Illustrate each of the above properties by drawing a triangle.
Write in your own words, how to classify triangles according to their angles.
: The angles 30 degrees, 60 degrees and 90 degrees represents a (an) ________ angled triangle.
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