(1) The size of a line segment is its length.
(2) The sum of lengths of all sides of a plane figure or the length of its boundary is called the perimeter of the figure
(3)The measurement of the region enclosed by a closed plane figure is called the 'area' of the plane figure.
(4) A square centimetre is the area of the region formed by a square of side 1 cm.
(5) Perimeter of a Square= 4 × length of a side = 4a
Area of Square= Side × Side =Side^{2}=a^{2}
(6) Perimeter of a Rectangle= 2× [length ( l ) + width (w)]
Area of a Rectangle= length ( l ) × breadth ( b)
(7) Perimeter of a Triangle= Sum of lengths of all sides = a + b + c.
Area of triangle = (1/2) × base × height = (1/2) × b × h
(8) Perimeter of an equilateral triangle = 3 × length of a side
(9) Perimeter of a Regular Pentagon= 5 × length of a side
(10) Perimeter of a Regular Hexagon= 6 × length of a side
(11) Perimeter of a Regular Octagon= 8 × length of a side
$Perimelengthofoneside\backslash text\{Perimeter\}\; =\; 5\; \backslash times\; \backslash text\{length\; of\; one\; side\}$
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1. What are the important formulas in mensuration for Class 6? 
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3. What is the formula for finding the perimeter of a rectangle in mensuration for Class 6? 
4. How do I calculate the area of a triangle using mensuration formulas in Class 6? 
5. Why is it important to know mensuration formulas in Class 6 mathematics? 

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