Rectangle
    {{{ errors }}}
base length: a
height: b
diagonal length: c
in degrees: θ
in degrees: β
perimeter rectangle: Pr
Surface area rectangle: SAr
perimeter triangle: Pt
semiperimeter triangle: s
surface area triangle: SAt
radius circumcircle: R
circumference of circumcircle: Cc
surface area circumcircle: SAc
radius incircle: r
circumference incircle: Cic
surface area incircle: SAic