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# Area Formulas

Geometry area formulas of a circle, sphere, triangle, rectangular, parallelogram, rhombus, ellipse, trapezoid, cone, surface area of a cone, cylinder, surface area of a cylinder, any circular sector and a general formula for any polygon with SolveMyMath.com Area Formulas!

Shape Formula Variables
Area of a Rectangle
l and w are the length and width of the triangle.
Area of a Parallelogram (in general)
b and h are the length of the base and of the perpendicular height
Area of a Rhombus
a and b are the lengths of the two diagonals of the rhombus.
Area of a Triangle
b and h are the base and altitude (height), respectively.
Area of a Circle
Area of a Ellipse
a and b are the semi-major and semi-minor axis.
Area of a Sphere, Circular area
, or
r is the radius and d the diameter.
Area of a Trapezoid
a and b are the parallel sides and h the distance (height) between the parallels.
Any Regular Polygon Area
a is the apothem, or the radius of an inscribed circle in the polygon, and p is the perimeter of the polygon.
Area of a Cylinder
r and h are the radius and height, respectively.
Lateral surface area of a cylinder
r and h are the radius and height, respectively.
Area of a Cone
r and l are the radius and slant height, respectively.
Lateral surface area of a cone
r and l are the radius and slant height, respectively.
Area of a Circular sector