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 Forum » EDUCATION » MATHEMATICS » LEARN FORMULAS FOR DIFFERENT POLYGONS: PART 1
LEARN FORMULAS FOR DIFFERENT POLYGONS: PART 1
AdminDate: Sunday, 02/Apr/2017, 08:23 | Message # 1
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LEARN FORMULAS FOR DIFFERENT POLYGONS: PART 1

RECTANGLE

Area = Length x Width (A = LW)
Perimeter = (Length + Width) x 2
Width = Area ÷ Length
Length = Area ÷ Width
Width = P/2 - Length
Length = P/2 – Width

SQUARE

Area by using its side = side x side
Area by using its diagonal = ½ x d2
Perimeter = side x 4
Side = Perimeter ÷ 4
Side = Square root of the area
Width = P/2 - Length
Length = P/2 – Width

TRIANGLE

Area = 1/2bh
Perimeter = sum of all sides surrounding the triangle
Height = (Area x 2) ÷ base
Base = (Area x 2) ÷ Height
Pythagoras theorem: a2 + b2 = c2 (a = height, b=base and c=hypotenuse)

PARALLELOGRAM

Area = Base x height
Base = Area ÷ Height
Height = Area ÷ Base

RHOMBUS

Area = ½ x d1 x d2 (d1 and d2 are diagonals of rhombus)

TRAPEZIUM (TRAPEZOID)

Area = 1/2h(a+b) or (a+b) ÷2 x h
Length a = [(area x 2) ÷ h] – b
Length b = [(area x 2) ÷ h] – a
Height = (area x 2) ÷ (a+b)

KITE

Area = ½ x d1 x d2 (d1 and d2 are diagonals of a Kite)

********* END OF PART ONE **********

donDate: Monday, 03/Apr/2017, 16:22 | Message # 2
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Thank you for the formulaes

mamDate: Thursday, 15/Jun/2017, 16:12 | Message # 3
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Me too

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