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Types of polygons<br />
Name Number of sides<br />
Triangle 3<br />
Quadrilateral 4<br />
Pentagon 5<br />
Hexagon 6<br />
Heptagon 7<br />
Octagon 8<br />
Nonagon 9<br />
Decagon 10<br />
Dodecagon 12<br />
Triangles<br />
Types of triangles:<br />
1. Scalene triangle: The sides of the triangle<br />
(i) are all of different length;<br />
(ii) angles are also of different sizes.<br />
2. Isosceles triangle: (i) two sides equal; (ii) two angles equal. The third side is the<br />
base. The vertex (F) opposite the base is called the vertex. The angle at the vertex<br />
is called Vertical angle. The bisector of the vertical angle of an isosceles triangle<br />
bisects the base at right angles.<br />
(i.e. DX = XE).<br />
3. Equilateral triangle: All the sides and angles are equal.<br />
4. An acute angled triangle has all three angles acute.
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