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

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