It has 3 sides
It has no diagonals
It has 3 interior angles
It has 3 exterior angle
Interior angles add up to 180 degrees
Exterior angles add up to 360 degrees
Can be right angled
Can be equilateral
Can be obtuse
Can be isosceles
Can be scalene
Multiples of a triangle can form other polygons
Its lengths, area and angles can be determined by means of trigonometry
Pythagoras' theorem is applicable to all right angle triangles
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An isosceles triangle has two equal sides
An isosceles triangle
a scalene triangle a scalene triangle
A triangle with at least two sides of equal length is called an isosceles triangle.
Yes. In fact, a triangle must have at least two acute angles.