Spike's Calculators
Area and Perimeter
Equilateral Triangle
Calculate the area and perimeter of an equilateral triangle. This calculator uses feet and or inches for measurements.
Equilateral triangle = a triangle with three sides of the same length.
Equilateral Triangle Area and Perimeter
Calculation
- side length in feet and or inches
- decimal precision, the number of digits after the decimal point
Results
- the height in decimal feet
- the area of the equilateral triangle 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 the equilateral triangle 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 = ab/4
P = 𝛑R(1+(3H)/(10+√(4-3*H)))
where A is the area of the ellipse
a length of the short diameter
b length of the long diameter
P the perimeter of the ellipse
𝛑 = 3.14159265
R = (a+b)/2
S = (a-b)/2
H = R²/S²
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)