Answer:
They both have area 4
Step-by-step explanation:
Area of the square:

Area of the triangle:
Using the left-side of the triangle as the base, and the height from the left-side to the bottom-right corner:


We know the length of the diagonal is
as we are using a centimetre grid, so we can create an isosceles triangle with side lengths 1 and our unknown length, we can then use Pythagorean Theorem to work out our unknown side length.




Answer:
13
Step-by-step explanation:
Just 9
I'm not sure for the second one but I think 1 ft
I think you answer should be 51
This is a function, imagine if there were a line going up and down through every point, if one of those lines hits 2 points then it's not a function