Question

Find the are of the following polygons:
1.) Circle,r=4.5m
2. Triangle,b=8.17m and h= 10.5m
3.trapezoid= a=9cm,b=12.4 cm , h= 7.7cm
4. Circle= d=25ft
5 . Trapezoid= a=12mm,b= 18.3mm,h=11.12mm

Answer 1

1) Area of circle=$\pi r^{2}$=63.61$m^{2}$

2)Area of triangle=$\frac{1}{2}$bh= 42.89$m^{2}$

3)Area of trapezoid=$\frac{(a+b)h}{2}$= 82.39$m^{2}$

4)Area of circle=$\pi r^{2}$

r=$\frac{d}{2}$=12.5

=>490.87$ft^{2}$

5)Area of trapezoid=$\frac{(a+b)h}{2}$= 168.468$mm^{2}$

*all approximate values