what are main point of angels and triangles ....
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The sum of all internal angles of a triangle is always equal to 180°. This is called the angle sum property of a triangle.
The sum of the length of any two sides of a triangle is greater than the length of the third side.
The side opposite to the largest angle of a triangle is the largest side.
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they have a right angle or acute angle or obtuse angle.
right angle - 90'
acute angle - 0 to 90
obtuse angle -90 to 180
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