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April 13, 2023
Angles
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1. Angle facts
April 13, 2023
The sum of the angles on a straight line is always 180º.
140º
40º
You can describe this rule using letters.
40 + 140 = 180
ba
a b
Explanation
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April 13, 2023
40º
The sum of the angles round a point is always 360º.
140º
140º
40º
You can describe this rule using letters.
a + b + c + d 140 + 40 +140 + 40 = 360
a
bc
d
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Explanation
April 13, 2023
40º
When two lines cross, the opposite angles are equal.
140º
140º
40º
You can describe this rule using letters.
a
b
a = b c = d
c d
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Explanation
April 13, 2023
The sum of the angles inside a triangle is always 180º.
You can describe this rule using letters.
a + b + c = 180
a
b
c
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Explanation
April 13, 2023
Right-angle
ScaleneEquilateral
Isosceles
These are the four types of triangle.
Equal sides can be shown using a small ‘dash’.
Revise
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April 13, 2023
ba
The sum of the angles in a quadrilateral is always 360º.
63º
104º124º
69º
= 360NextNextMoreMore
+ + +c d
a
b
cd
69 63 104 124
Explanation
April 13, 2023
The angles in this quadrilateral still add up to 360º, even though it is a re-entrant shape.
You can see this if you think of it as two triangles.
180 + 180 = 360
Explanation
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April 13, 2023
Find the missing angles.
ab
c144º
88º132º
78º
65º
144º46º
85º
Practise
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