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There will be 3 types of angles
the obtuse angle the right angle the acute an
gle

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The obtuse angle is an angle which
has a larger angle than 90.
An obtuse angled triangle usually has one obtus
e angle and two acute angles.
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This is a right angle which is 90
where the other two angles are
acute angles.
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This is a acute angled triangle.
They are all acute angles and they
are less than 90.
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The properties of an equilateral triangle
All Three sides of the triangle are equal
All angles are 60º
Has 3 axes of symmetry
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The Properties of an isosceles triangle
Two sides of the triangle are equal
Two base angles are equal Has one axis of symmetr
y
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The Properties of a Scalene Triangle
All the sides are not equal to each other
All angles are different There are no axis of sy
mmetry
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All triangles are equal to 180
degrees regardless of shape or size.
180
180
180
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The 3 angles of a triangle equal a straight line
.
a
a
b
c
b
c
A straight line 180 therefore abc180
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If there are two angles of a triangle that are
60and 40 then the other angle must be 80

60
Note 180-(4060) x x 80
Ahhh thats Right!
x
40
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To find x and y, you must analyse the triangle.
Finding y
Finding x
Step 1 Since you have worked out
that y50 you can work out
x knowing that 180 is the sum
of all triangles
Step 1 y is a part of the straight line
Step 2 Work out y by 180-130
Step 3 y180-130
x
80
Step 4 y50
Step 2 x 180-(5050), you do
what's in the brackets first
Step 3 x 180-100
Step 4 x 80
y
50
130
50
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