Answer:
20
Step-by-step explanation:
An easy way is to just count the grids blocks, which are squares.
There are 18 of these.
For the rest, since they are in the shape of a triangle, they will count as a half grid block.
There are 4 of these, which are 4 halfs, which equal to 2 square blocks.
Add them, 18+2=20
