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Area of a square : One side x 2
Area of triangle : Width x Height then divide by 2
Area of parallelogram : Width x Height
Area of Trapizoid : base 1 x base 2 then divide by 2, next multiply times the height

I'm pretty sure that all you need to know since this is an elementry school question.
Lindarose

Finding Area varies based on what you are trying to find.

Area of a triangle is 1/2(Base)(Height)

EX: B=10 , H= 15

A=1/2(10)(15)

A=5(15)

A=75^2

Area of a Square or rectangle is Length(Width)

EX: L=10 , W=15

A=10X15

A=150^2

Area of a circle is 3.14(Radius^2) or 3.14(Diameter)

R=10 , D=20

A= 3.14(10^2)

A=314

OR

A=3.14(20^2)

A=1256

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