Area of 2D objects

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Overview:

The videos discuss how to find the area of circle, rectangle, square, trapezoid and parallelogram.

Recall that if $r,b,h$ are radius, base and height the area of the objects above are

Circle: $A=\pi r^2$ .
Rectangle: $A=bh$ or if the length and width are $l$ and $w$ then $A=lw$ .
Trapezoid: if $b_1,b_2$ are two parallel sides of trapezoid, then the area is $A=\frac{1}{2}\frac{b_1+b_2}{h}$ .
Parallelogram: $A=bh$ ..