You can find the perimeter and area formulas of all geometric shapes from the image below. We wish everyone a good work...
Rectangle perimeter = 2(a+b)
Rectangle area = a.b
Square perimeter = 4a
Square area = $a^2$
Triangle perimeter = a+b+c=2s
Triangle area = 1:1/2*b*h & 2: $\sqrt{s(s-a).(s-b).(s-c)}$
Right triangle perimeter = b+h+d
Right triangle area = 1/2 bh
Equilateral triangle perimeter = 3a
Equilateral triangle area = 1: 1/2 a.h & 2: $\frac{\sqrt{3}}{4}.a^2$
Isosceles right triangle perimeter = 2a+d
Isosceles right triangle area = 1/2 a^2
Parallelogram perimeter = 2(a+b)
Parallelogram area = a.h
Rhombus perimeter = 4a
Rhombus area = 1/2 d1 d2
Trapezium perimeter = Sum of its four sides
Trapezium area = 1/2 h(a+b)
Circle perimeter = 2πr
Circle area = πr^2
Semicircle perimeter = πr+2r
Semicircle area = 1/2πr^2
Ring (shaded region) perimeter = -
Ring (shaded region) area = π(R^2-r^2)
Sector of a circle perimeter = I + 2r where I = (Ɵ / 360) * 2πr
Sector of a circle area = Ɵ/360 * πr^2
