The triangle PQR isn't a square triangle.
PQ = 9.9cm
QR = 22.3cm
RP = 18.1cm
(Going around the triangle anti clockwise)
P
Q R
Calculate the area of the triangle.
Please help me and state how you did it
This problem can also be solved using Heron's formula
$\displaystyle A=\sqrt{s(s-a)(s-b)(s-c)}, \mbox{ where } s=\frac{a+b+c}{2}$
and a,b,c are the side lengths of the triangle.
$\displaystyle s=\frac{9.9+22.3+18.1}{2}=25.15$
so the Area is
$\displaystyle A=\sqrt{(25.15)(25.15-9.9)(25.15-22.3)(25.15-18.1)} \approx 87.79cm^2$