Area Calculators (simple)

Rectangle Formula - A = L x W
Enter the length
Enter the width
	square units
Regular Triangle Formula - A = B x 1/2 x H
Enter the width of the base
Enter the height of the triangle
	square units
Right Triangle (Regular, Isosceles or 30-60-90) Formula - A = B x 1/2 x H
Enter the width of the base
Enter the height of the triangle
	square units
Irregular Triangle Formula - s = (a + b + c) / 2 or 1/2 of the perimeter of the triangle Formula - A = SquareRoot(s * (s - a) * (s - b) * (s - c))
Enter the length of side one
Enter the length of side two
Enter the length of side three
	square units
Square Formula - A = L x L
Enter the length of one edge
	square units
Circle Formula - A = PI x (r x r)
Enter the radius of the circle
	square units
Rhombus Formula - A = (D1 x D2) / 2
Enter the greater diameter
Enter the smaller diameter
	square units
Regular Polygon Formula - A = 1/2 * a * l * n
Enter the apothem (radius of inscribed circle)
Enter the number of sides
Enter the length of each side
	square units
Trapezium Formula - A = (.5 * h) * (p1 + p2)
Enter the first parallel side
Enter the other parallel side
Enter the height
	square units

Rectangle