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Triangles
A triangle is a three
sided polygon
...
Types of
triangles
1
...
Isosceles triangle
3
...
Right- angled triangle
Equilateral
triangle
Properties of an
equilateral triangle
1
...
2
...
3
...
4
...
Area= 1/2 ×base × height
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Perimeter= length × 3
Isosceles
triangles
properties of
Isosceles triangle
Base angle
Base angle
1
...
2
...
3
...
4
...
Area= 1/2 × base × height
6
...
Scalene
triangle
Properties of
Isosceles
triangle
1
...
2
...
3
...
4
...
5
...
6
...
Right - angled
triangle
Properties of
right - angled
triangle
...
None of the sides are equal
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None of the angles are equal
...
It has no line of symmetry
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One of the angles is 90
5
...
6
...
7
...
Hypotenuse
Examples: find the lettered
angles
...
Two angles of a triangle are 35
and 65 degrees respectively
...
2
...
Find the other angle
...
80
4
...
90
45
Solution:
1
...
= 80
2
...
X+ 90+ 54= 180
X + 144
...
= 180 - 144
X = 36
3
...
X+ X + X = 180
3X = 180
X = 180÷3
X= 60
...
4
...
X + 90 + 45 = 180
X + 135 = 180
X
...
= 45