Spike's Calculators
Area and Perimeter
Pentagram
Calculate the area and perimeter of a pentagram.
This calculator uses feet and or inches for measurements.
Pentagram = a five-pointed star that is formed by drawing the diagonals in a pentagon.
Pentagram Area and Perimeter
Calculation
- the length of a side in feet and or inches
- decimal precision, the number of digits after the decimal point
Results
- the area of the pentagram in decimal square feet
- area in square feet and inches
- the area in decimal square inches
- the area in square inches
- the area in square metres
- the perimeter of pentagram in decimal feet
- the perimeter in lineal feet and inches
- the perimeter in decimal inches
- the perimeter in inches
- the perimeter in metres
Formula
A = √5(5-2√5w²/2 P = v*10 where A is the area of the pentagram P the perimeter of the pentagram v = s/((1+√5)/2) u = v/((1+√5)/2) w = v+u s the length of a side
Conversions
one square foot ( ft²) = 144 square inches (in²) one square inch (in²) = 0.00694444444444443 square feet (ft²) one square foot ( ft²) = 0.09290304 square metres (m²) square inch (in²) = 0.00064516 square metres (m²)