Answer:
The area of triangle is 3444 mm².
Step-by-step explanation:
First, you have to convert the length of square into millimeters :
[tex]1cm = 10mm[/tex]
[tex]8.2cm = 10mm \times 8.2[/tex]
[tex]8.2cm = 82mm[/tex]
Next, you have to apply area of square formula, A = length×height :
[tex]area = length \times height[/tex]
[tex]let \: length = 82,height = 42[/tex]
[tex]area = 82 \times 42[/tex]
[tex]area = 3444 {mm}^{2} [/tex]
