please help me I can't understand the module

Answer:
[tex]44 \: {cm}^{2} [/tex]
Step-by-step explanation:
Derived Equation
A = k x b x h
If A = 65, b = 10, h = 13
then solve for k;
[tex]65 =k \times 10 \times 13 \\ 65 = k \times 130 \\ \frac{65}{130} = k \\ \frac{1}{2} = k \\ k = \frac{1}{2} [/tex]
Now, the equation became
[tex]a = \frac{1}{2} \times b \times h[/tex]
[tex]a = \frac{1}{2} \times 8 \times 11 = \frac{88}{2} = 44 \: {cm}^{2} [/tex]
*Note:
a - capital dapat pero dahil walang upper case pag mag insert ng equation. Ikaw na bahala pag isusulat mo na.