Category : 7th Class
Perimeter and Area
(a) Perimeter of a square= 4\[\times \]side units
(b) Perimeter of a rectangle = 2\[\times \](length + breadth) units
(c) Area of a square = side \[\times \] side sq. units
(d) Area of a rectangle = length \[\times \] breadth sq. units
= \[\frac{1}{2}\] \[\times \]base \[\times \] height sq. units
The fixed point 0 is called the centre of the circle and the constant distance r is called the radius of the circle.
Here \[\pi \](Pi) is a constant, equal to 3.14 approximately.
Area of path formed between two concentric circular regions \[=\left( \pi {{R}^{2}}-\pi {{r}^{2}} \right)\] sq. units
\[=\pi \left( {{R}^{2}}-{{r}^{2}} \right)\]square units
\[=\pi \left( R+r \right)\left( R-r \right)\]square units
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