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Geometry Things to Remember  Very helpful high school Geometry cheat sheet

Geometry Formulas  Very nice printable page of Geometry Formulas. Includes the typical shapes plus formulas normally not found like,annulus,ellipse,torus.

# Geometry Formulas Chart

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 Area of a Circle A = Π x square of radius Area of Equilateral Triangle A = (side^2) √3)/4 Area of n gon A = ½ apothem * Perimeter Area of a Parallelogram A= base x height Area of a Rectangle A = length x width Area of a Rhombus A = ½ Diagonal 1* Diagonal 2 Area of a Square A = Side^2 Area of a Trapezoid A = ½ ( Base1 + Base 2 ) height Area of a Triangle A = ½ Base x Height Base Area of Heptagon Area of Base = ½ apothem * perimeter Base Area of Hexagon Area of Base = ½ apothem * perimeter Base Area of Octagon Area of Base = ½ apothem * perimeter Base Area of Parallelogram Area of Base = base * altitude Base Area Pentagon Area of Base = ½ apothem * perimeter Base Area Rectangle Area of Base = length * width Base Area Square Area of Base = Square of side Base Area Trapezoid Area of Base = ½ (height)(base 1 + base2) Base Area Triangle Area of Base = 1/2base * height Circumference of a Circle C =2 x Π x radius Distance Formula D=√(x2-x1)2 + (y2 –y1)2 Equation of a Circle General Form (x-h) 2 +( y-k) 2 h and K are coordinates of the circle and r = radius 45 45 90 Triangle Hypotenuse H= leg√2 45 45 90 Triangle Legs 1⁄2 hypotenuse√2 Heron’s Formula s=(a+b+c)/2 then A= √(s(s-a)(s-b)(s-c)) Horizontal Line Y = ( any number) Lateral Area of Cone πrsl r = radius sl = slant height Lateral Area Cube 4s2 s=side Lateral Area Cylinder Circumference x Height Lateral Area Prism Perimeter x height Lateral Area Pyramid 1/2P * sl sl =slant height P=perimeter Lateral Area Rectangular Solid Perimeter *height Lateral Area Right Cone LA = ½ Psl P=2πr sl = slant height Lateral Area Right Cylinder LA = 2πr*h Lateral Area Right Prism LA = Ph P = sum of base sides h = height Midpoint Formula ( X1 + X2)/2 , (Y1 + Y2)/2 Perimeter of a Parallelogram P= 2( base + side) Perimeter of a Rectangle P= 2(base + height) Perimeter n gon P = number of sides * sides Perimeter of a Rhombus P= 4 x side Perimeter of a Square P = 4 x side Perimeter of a Trapezoid Base1 + Base2 + Side1 + side 2 Perimeter of a Triangle Side A + Side B + Side C Point Slope Form y-y1 = m(x-x1) Slope Y2-Y1 X2-X1 = Rise over Run Slope Intercept Form y = mx + b M = slope b = y intercept Surface Area of a Cone SA= π*radius*slant height+ πradius2 Surface Area of a Cube SA = 6side2 Surface Area of a Cylinder Lateral Area + 2πradius2 Surface Area of a Prism Lateral Area + 2Base Surface Area of a Pyramid Lateral Area + 1Base Surface Area of a Rectangular Prism 2(length*width + length*height + height*width) Surface Area of a right Cone SA=1/2*Diameter*π*slant height+base Surface Area of a Right Cylinder 2πradius2 +2πradius x height Surface Area of a Right Prism SA = Perimeter * height + 2 Base Surface Area of a Sphere 4πradius2 30 60 90 Triangle short and long legs Short leg =½ hypotenuse Long leg = 1⁄2 hypotenuse√3

Formula chart for Geometry. Use these Geometry formulas to calculate perimeter, area, base area, lateral area, and surface area for various Geometric shapes along with the distance formula, and equation of a circle. Over 70 formulas included. The geometry formula sheet is also available for download. Hope it helps