R=B(m+b) "b"

B=CD² "C"
-------
2


w y w=8,y=6,z=2
- = - "x"
x z




A=6*h "h" A=20,b=5
-----------
2






C=B+b
------- (h) "B" C=36,b=9,h=6
2










A=π d² "d" A=19,π=3.14
-------
4