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1.
Equilateral triangle perimeter
$P=3a$
2.
Isoscales triangle perimeter
$P=a+2b$
3.
Perimeter of a square
$P=4a$
4.
Rectangle perimeter
$P=2a+ab$
5.
Parallelogram perimeter
$P=2a+2b$
6.
Rhombus perimeter
$P=4a$
7.
Circle perimeter
$P=2r\pi $
8.
Circle area -verison 3
$ A = \dfrac{P \cdot r }{2}$