What is the measure of the number of unit squares needed to cover a flat surface - area or perimeter?

Which triangle congruence postulate or theorem justifies my claim that the steps i made using construction paper and scissors produce an isosceles triangle? was it sss, sas, asa, aas, or hl?

I'm confused on this could anyone me and show me what i need to do to solve it.

Which graph has a rate of change of zero