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Properties of Triangles and the Interior and Exterior Angles of Triangles - Part 1
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Definition of axis of symmetry
A straight line that divides a shape or figure into two parts of equal size and shape

Equilateral triangle
Number of axes of symmetry = 3

Isosceles triangle
Number of axes of symmetry = 1

Scalene triangle
Number of axes of symmetry = 0

Acute-angled triangle
Every interior angle is an acute angle

Obtuse-angled triangle
One of the interior angles is an obtuse angle

Right-angled triangle
One of the interior angles is a right angle
The sum of all the interior angles of a triangle
The sum of an interior angle and its adjacent exterior angle
The exterior angle of a triangle
Equal to the sum of the two interior opposite angles
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Properties of Triangles and the Interior and Exterior Angles of Triangles - Part 1
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