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Area enclosed by a circle. Definition and formula
Area enclosed by an ellipse. Definition and formula
Area of a circular segment and a formula to calculate it from the central angle and radius.
Two formulas for the area of a kite
Area of a parallelogram. Definition and formula
Area of a rectangle. Definition and formula
Area of a square. Definition and formula
Area of a trapezoid. Definition and formula
The conventional method of calculating the area of a triangle (half base times altitude) with pointers to other methods and special formula for equilateral triangles
How to determine the area of a triangle given the coordinates of the three vertices using a formula
A method of calculating the area of a triangle when you know two sides and the included angle (SAS) - half abSin(C)
How to determine the area of a triangle given the coordinates of the three vertices using a bounding rectangle
Area of an annulus. Definition and formula
A method of calculating the area of an equilateral triangle using a simplified formula
How to find the area of an irregular polygon by breaking it down into triangles
A method for finding the area of any polygon - regular, irregular, convex, concave if you know the coordinates of the vertices.
A method for calculating the area of a triangle when you know all three sides.
A calculator that will calculate the area of a polygon given the coordinates of its vertices
Area and perimeter of a rectangle (coordinate geometry)
Formula for the area of a regular polygon
Demonstration that a triangle with fixed perimeter does not have a constant area.
Formula for the area of a rhombus
Area and perimeter of a square (coordinate geometry)
How to derive and find the surface area of a cylinder
How to calculate the area and perimeter of a trapezoid given the coordinates of its vertices
Similar triangles - ratio of areas is the square of the ratio of the sides.
Video: Instructor explains finding the area of a trapezoid given bases, legs and altitude.
Video: Instructor explains finding area of a trapezoid given bases, one leg and two angles.
Video: Instructor shows on a whiteboard the derivation of the formula for the area of a trapezoid
Video: Instructor explains finding a base of a trapezoid given area, one base and altitude.
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