Mensuration (Perimeter & Area, Review of Earlier Concepts)
Category : 6th Class
MENSURATION
(Perimeter and Area, Review of Earlier Concepts)
FUNDAMENTALS
(a) Perimeter of a square \[=4\,\,\times \]side.
Elementary question-1: Find perimeter of a square kabaddi field each of whose side is 20 metres Ans. Perimeter \[4\times 20=80\,\,m\]
(b) Perimeter of a rectangle \[=2\times \] (length + breadth) units.
(c) Area of a square = (side \[\times \] side).
(d) Area of a rectangle = length \[\times \] breadth.
(e) Area of a parallelogram = base \[\times \] height sq. units.
(f) Area of a triangle \[=\frac{1}{2}\] (Area of the parallelogram generated from it)
\[=\frac{1}{2}\times \]base \[\times \] height sq. units
Circumference \[=2\pi r=\pi d,\] where \[r=\]radius and \[d=\]diameter.
Here \[\pi \,\,(Pi)\] is a constant, equal to\[3.14\] approximately.
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