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Area of Plane Shapes
Triangle Area = ½b × h b = base h = vertical height | Square Area = a2 a = length of side | |||
Rectangle Area = w × h w = width h = height | Parallelogram Area = b × h b = base h = vertical height | |||
Trapezoid (US) Trapezium (UK) Area = ½(a+b) × h h = vertical height | Circle Area = πr2 Circumference=2πr r = radius | |||
Ellipse Area = πab | Sector Area = ½r2θ r = radius θ = angle in radians |
Here is an example:
Example: What is the area of this rectangle?
The formula is:
Area = w × h
w = width
h = height
w = width
h = height
We know w = 5 and h = 3, so:
Area = 5 × 3 = 15
trapezoid = h/2 (b1 + b2)
triangle = | one half times the base length times the height of the triangle |
equilateral triangle = |
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triangle given SAS (two sides and the opposite angle)= (1/2) a b sin C
triangle given a,b,c =
regular polygon = (1/2) n sin(360°/n) S2
when n = # of sides and S = length from center to a corner
Surface area.
A = 4πr2 (sphere).List of formulae
Shape | Formula | Variables |
---|---|---|
Regular triangle(equilateral triangle) | s is the length of one side of the triangle. | |
Triangle | s is half the perimeter, a, b and care the length of each side. | |
Triangle | a and b are any two sides, and Cis the angle between them. | |
Triangle | b and h are the base and altitude(measured perpendicular to the base), respectively. | |
Square | s is the length of one side of the square. | |
Rectangle | l and w are the lengths of the rectangle's sides (length and width). | |
Rhombus | a and b are the lengths of the twodiagonals of the rhombus. | |
Parallelogram | b is the length of the base and h is the perpendicular height. | |
Trapezoid | a and b are the parallel sides and hthe distance (height) between the parallels. | |
Regular hexagon | s is the length of one side of the hexagon. | |
Regular octagon | s is the length of one side of the octagon. | |
Regular polygon | l is the side length and n is the number of sides. | |
Regular polygon | p is the perimeter and n is the number of sides. | |
Regular polygon | R is the radius of a circumscribed circle, r is the radius of an inscribed circle, and n is the number of sides. | |
Regular polygon | a is the apothem, or the radius of an inscribed circle in the polygon, and p is the perimeter of the polygon. | |
Circle | r is the radius and d the diameter. | |
Circular sector | r and θ are the radius and angle (inradians), respectively. | |
Ellipse | a and b are the semi-major andsemi-minor axes, respectively. | |
Total surface 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. | |
Total surface 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. | |
Total surface area of a Sphere | r and d are the radius and diameter, respectively. | |
Total surface area of an ellipsoid | See the article. | |
Total surface area of a Pyramid | B is the base area, P is the base perimeter and L is the slant height. | |
Square to circular area conversion | A is the area of the square in square units. | |
Circular to square area conversion | C is the area of the circle in circular units. |
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