WOLFRAM|DEMONSTRATIONS PROJECT

The Product of the Inradius and Semiperimeter of a Triangle

​
show r
AB
≈
6.62
BC
≈
6.22
AC
≈
7.80
r
≈
1.92
s
≈
10.32
area(ABC)
≈
19.85
r
×
s
≈
19.85
Let ABC be a triangle,
r
its inradius, and
s
its semiperimeter. Then
area(ABC)=r×s
.