Geometric Shapes - Areas

Calculate areas and related measurements for various geometric shapes including squares, rectangles, triangles, circles, and 3D shapes.

Calculator

Select Shape

Side a (m)

Side b (m)

Height h (m)

Radius r (m)

Angle (degrees) (°)

Side c (m)

Area-- m²

Diagonal-- m

Circumference-- m

Shape	Formula	Variables
Square	A = a²	a = side
Rectangle	A = a × b	a, b = sides
Parallelogram	A = a × h or a × b × sin(α)	a, b = sides, h = height, α = angle
Equilateral Triangle	A = (a² × √3) / 4	a = side
Triangle	A = a × h / 2 or A = r × s	a = base, h = height, r = inradius, s = semiperimeter
Trapezoid	A = (a + b) × h / 2	a, b = parallel sides, h = height
Hexagon	A = (3 × √3 × a²) / 2	a = side
Circle	A = π × r² or A = π × d² / 4	r = radius, d = diameter
Sector of Circle	A = (1/2) × θr × r² or (θd × π × r²) / 360	θr = angle in radians, θd = angle in degrees
Segment of Circle	A = (1/2) × (θr - sin(θr)) × r²	θr = angle in radians
Cylinder	A = 2 × π × r × h	r = radius, h = height
Cone	A = π × r × l or π × r × √(r² + h²)	r = radius, h = height, l = slant length
Sphere	A = 4 × π × r²	r = radius