Girl i can barley see that
The vertices of the attached triangle are
A(9, 0)
B(0, 4)
O(0, 0)The leg lengths of this triangle are 9 and 4 units. Its area can be computed using the formula for the area of a triangle.
A = (1/2)(9)(4) = 18 . . . . square units
Since the result of this calculation is 18 square units, we know it has the correct area.
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The area measuring tool in the drawing app also shows the area to be 18.
All you have to do is 12 times 4.5 . and that's your answer