Post on 19-Jan-2016
transcript
Triangles
Shapes with 3 sides!
Equilateral Triangle
All 3 Sides are equal in Length
All 3 interior angles are the same
Isosceles Triangle
Two Sides of equal Length
Two interior angles are the same
Scalene Triangle
No Sides of equal Length
All interior angles are different
Right-Angled Triangles
They have an Interior angle of 90 degrees
Right-Angled Triangles can be either Isosceles or scalene triangles
Scalene Right Angled Triangle Isosceles Right Angled Triangle
What type of triangle is this?
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An Equilateral Triangle
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How many lines of symmetry has an Equilateral Triangle got?
1
2 3
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Properties of an Equilateral Triangle
Has 3 equal sides
Has 3 equal angles
Each angle is a 60o angle
Has 3 lines of symmetry
Is a regular shape
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What type of triangle is this?
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An Isosceles Triangle
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How many lines of symmetry has an Isosceles Triangle got?
1Triangles
Properties of an Isosceles Triangle
Has 2 equal sides
Has 2 equal angles
Has 1 line of symmetry
Is an irregular shapeTriangles
What type of triangle is this?
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A Scalene Triangle
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None!
How many lines of symmetry has a Scalene Triangle got?
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Properties of an Scalene Triangle
Has NO equal sides
Has NO equal angles
Has NO lines of symmetry
Is an irregular shapeTriangles
What type of triangle is this?
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A Right Angled Triangle
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A Right Angled Triangle is different
It may be scalene or it may be isosceles
But it always has a right angle!
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Properties of a Right Angled Triangle
Has 1 right angle
May be an isosceles triangle
May have 1 line of symmetry
Is an irregular shape
It will be isosceles and have 1 line of symmetry when these 2 sides are equal.
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