2D Shapes - Triangles
Triangles are 2 dimensional shapes which have three sides, three angles and three vertices. The three angles of a triangle always add up to 180°.
There are four types of triangle: Equilateral, Scalene, Isosceles and Right-Angled.
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Equilateral Triangle |
3 sides of equal length
3 vertices
3 equal angles
The angles of a triangle always add up to 180°, therefore each angle of an equilateral triangle
is, 180 ÷ 3 = 60° |
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Isosceles Triangle
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2 sides of equal length
3 vertices
2 equal angles
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Scalene Triangle
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No equal sides
No equal angles
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Right-Angled Triangle
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One angle is a Right Angle (90°)
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Acute-Angled Triangle
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3 Acute angles
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Obtuse-Angled Triangle
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1 Obtuse angle
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Remember
All the angles of a triangle add up to 180°
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