The other sides will be 16 inches long, because 13-3=10, and 10+6=16
Is it necessary
Can I get it cheaper elsewhere
Will it last a while
These are just 3 I came up with. I do not know if they are what your teacher would have put.
False, Complementary angles equal to 180 degrees and Supplementary angles equal to 360 degrees
I’m not sure if this is right but im guessing c.