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# Polygon Formulas

### Geometry formulas for common geometric shapes

polygonformula
area of a triangle 1/2bh
perimeter of a parallelogram Perimeter = a + b + a + b = 2a + 2b
area of a rectangle A=lw
perimeter of a square P=4s
area of a trapezoid A= (a + b)h / 2
perimeter of trapezoid P=s1+s2+s3+s4
perimeter of a triangle P=s1+s2+s3
area of a square A=S*S or S2
circumference of a circle 2*3.14*r
area of a circle A = πr ^2
area of a parallelogram Area = b x h
sum of interior angles (reg polygons) 180(n-2)
sum of interior angles (n-2)180
no.of exterior angles (regular polygon) 360/n
no. of exterior angles equal no. of sides
Created by: jlprince