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Unit: Geometry
Chapter: Quadrilaterals & Circles
Reference: – Introduction to Quadrilaterals, Sides, Vertices, Angles & Diagonals of a Quadrilateral, Types of Quadrilaterals (Square, Rectangle, Parallelogram, Rhombus, Trapezium, Kite), Angle Sum Property of a Quadrilateral (360°), Introduction to Circles, Centre, Radius, Diameter, Circumference, Chord, Arc, Sector, Segment
After studying this chapter, you should be able to understand:
- Introduction to Quadrilaterals & Their Components
- Sides, Vertices, Angles and Diagonals of a Quadrilateral
- Types of Quadrilaterals (Square, Rectangle, Parallelogram, Rhombus, Trapezium, Kite)
- Angle Sum Property of a Quadrilateral (360°)
- Introduction to Circles & Their Parts
- Centre, Radius, Diameter and Circumference
- Chord, Arc, Sector and Segment
Understanding Elementary Shapes: Triangles
Classification of triangles: Triangles are classified based on angles as well as the relative length of the sides of a triangle.
Equilateral Triangle: When all the sides of triangle are equal. An Equilateral triangle is also called a regular polygon. It is because all angles are equal and all sides are equal to each other.
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Isosceles Triangle: When ONLY two sides of triangle are equal in length.
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Scalene Triangle: When all sides of triangle are of unequal
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On the basis of Angles can be classified as:
Acute Angled Triangle: If each angle of triangle is less than 90°
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,then it is acute angled triangle.
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Right Angled Triangle: If One angle in a Triangle is equal to 90°
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, then it is called right angled triangle.
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Obtuse Angled Triangle: When one of the three angles in a triangle is greater than 90°
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, then it is obtuse angled triangle.
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