Class 8 Maths - BIHAR
Area
In this Class 8 Bihar Board Mathematics chapter, students will explore the concept of Area for various 2D shapes. You will learn how to calculate the area of rectangles, squares, parallelograms, triangles, trapeziums, and general quadrilaterals. The chapter also introduces the idea of area of a circle and composite figures. Understanding this chapter is essential because it builds spatial reasoning and forms the foundation for surface area and volume chapters in higher classes. Board exams frequently feature numerical problems based on these formulas, making it a high-scoring and crucial topic for your final examination.
Start Learning FreeKey Concepts
Area of Rectangle and Square
The area of a rectangle is the product of its length and breadth, while the area of a square is the square of its side length.
Area of Parallelogram
The area of a parallelogram is calculated by multiplying its base by the corresponding height (altitude).
Area of Triangle
The area of any triangle is half of the product of its base and height, which can also be derived by dividing a parallelogram in half.
Area of Trapezium
The area of a trapezium is half the product of the sum of its parallel sides and the perpendicular distance between them.
Area of General Quadrilateral
The area of a general quadrilateral can be found by dividing it into two triangles by drawing a diagonal and adding their areas.
Important Formulas
Board Exam Info
In the Bihar Board Class 8 Mathematics examination, the chapter on Area typically carries around 6 to 10 marks. Common question types include direct formula-based numericals, word problems involving fields or paths around gardens, and finding the dimensions of shapes when the area is given.
Frequently Asked Questions
What is the difference between perimeter and area?
Perimeter is the total length of the outer boundary of a closed shape, whereas area is the total region or space enclosed inside that boundary.
How do I find the height of a parallelogram if its area and base are given?
You can find the height by dividing the total area by the given base, using the rearranged formula: height = Area / base.
Why do we use different formulas for different quadrilaterals?
Different quadrilaterals have different geometric properties and side relationships, so specialized formulas make it easier and faster to calculate their enclosed space than splitting them every time.
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