The 5 Angle Rules All you need for almost any angle problem 1 1 2 2 3 3 4 4 ? ? ? ? ? ? ? ? ? ?
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The 5 Angle Rules All you need for almost any angle problem 1 2 3 4 ? ? ? ? ?
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Transcript of The 5 Angle Rules All you need for almost any angle problem 1 1 2 2 3 3 4 4 ? ? ? ? ? ? ? ? ? ?
The 5 Angle Rules
All you need for almost any angle problem
11
22
33
44??
?
??
11
22
33
Parallel lines
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• Any Triangle
All angles add up to 180o
Special triangles:• Isosceles Triangle: 2 equal angles
• Equilateral Triangle: 3 equal angles (all 60o)
Only need 1 angle
to find all the rest
All angles equal, s
o
all angles 60o
55
The 5 Angle Rules
All you need for almost any angle problem
11
22
33
44
?
?
?
??
Total angles in 3 triangles = 3 x 180 = 540o
What is the smallest number of triangles you can split this shape up into?
So total angles in a pentagon = 540o
4 triangles = 4 x 180 = 720o
Hexagon = 6 sides
5 triangles = 5 x 180 = 900o
Heptagon = 7 sides
10 triangles = 10 x 180 = 1800o
Dodecagon = 12 sides