Question

I need help finding the area

Answer 1

Basically you can just multiply the 9

Answer 2

Finding the area of a triangle is very similar to finding the area of a square or rectangle, only with an extra step added. You multiply the width by the height, then, since a triangle is half of a rectangle, you divide the product by 2, like in this formula.

$\frac{(w \times h)}{2}$

In this case, the width and height would both be 9mm, and 9×9=81. Now, all you need to do divide 81 by 2, which should give you the final answer of 40.5mm².

$\frac{(9 \times 9)}{2} = \frac{81}{2} = 40.5$