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How do I calculate area on uneven shapes?

Answer: 325mm
Step-by-step explanation:
To calculate shapes like this, you need to find the area of each of the shapes and add them.
The bigger square is 15 * 15 = 225
The smaller square is 10 * 10 = 100
Then add them: 225 + 100 = 325
Answer:
you take the the shape and divided as shown and then take 2 sides of 1 square and multiply them and that the area of 1 and do the same for the other square and then add the 2 areas together and the answer will be the area for all of it together
Step-by-step explanation: