The diagram shows a garden plot. the area of the garden is
square feet. the length of fencing required to completely enclose the garden is
feet.

A = 1/2(b1+b2) h
A = 1/2(6 + 12) 8
A = 9 * 8 
A = 72

answer 
A = 72 ft^2

To find distance between points C(xC,yC) and B(xB,yB), we use formula:

d(C,B)=√[(xB−xC)^2+(yB−yC)^2]
d(C,B)=√[(16-10)^2+(12−4)^2]
d(C,B)=√[6^2+8^2]
d(C,B)=√(36+64)
d(C,B)=√100
d(C,B)=10 ft

The length of fencing required = 6 + 12 + 8 + 10 = 36 ft