a = 100
a
## [1] 100
b = 216
b
## [1] 216
c = a-b/2
c
## [1] -8
d = (a/2)+(b*2)/10
d
## [1] 93.2
e = (a/2)*(b/2)
e
## [1] 5400
x <- 5*2
100/2-> x
x  
## [1] 50
f = tan(30)
f
## [1] -6.405331
g = tan(30)+tan(45)
g
## [1] -4.785556