Maths chapter 11 measuration notes for class 8 th pls tell me
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Revision Notes on Mensuration
Mensuration
It is all about the measurement of area, perimeter and volume of the plane and solid figures.
Mensuration
Area
The surface covered by the border line of the figure is the area of the plain shape.
Unit of the area is square if the length unit.
Perimeter
The perimeter is the length of the boundary of the plane shape.
The unit of the perimeter is same as the length unit.The green part is the area of the square and the distance all the way around the outside is the perimeter.Area of Trapezium
A trapezium is a quadrilateral whose two sides are parallel. And if its non-parallel sides are equal then it is said to be an isosceles trapezium.
Trapezium
Area of Trapezium can be found,
1. By Splitting the figure
One way to find the Area of trapezium is to divide it into two or three plane figures and then find the area.
Area of Trapezium
In the trapezium ABCD,
It can be divided into two parts i.e. a rectangle and a triangle.
Area of ABCD = Area of ABED + Area of DEC
2. By using formula
Another way is to calculate the area by using formula.
Formula of trapezium
Area of trapezium is half of the product of the summation of the parallel sides and the perpendicular distance between them.
Your answer is in the attachment.
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