That is not enough information.
If you look at the graphic, diagonal BD (along with point E), can be moved up and down the long diagonal and the two diagonals will still have the same length. You need to state additional information.
Answer:
in step 4
Step-by-step explanation:
we have

so step 1 is correct
step 2

so step 2 is correct
step 3

so step 3 is correct
step 4

so step 4 is incorrect
Answer:

Step-by-step explanation:
You can understand the statement from many perspectives, but in terms of proposition logic it is best to understand it as "negation of a" or " b" in mathematical terms is written like this

You can show that they are logically equivalent because they have the same truth table.
Exact value of that equation is 4
The area including cutout is 15*8=120
the area of cutout is 5*5=25
120-25=95 cm²