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		r is the radius.
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		r and θ are the radius and angle (in radians), respectively.