A square has sides of 10cm. what is its area?

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?

What are the coordinates of the midpoint of ab? ,1/2) /2,-1) ,-3/2) /2,-2)

For what values of the variable x is the expression square root of 7x+14+ square root of 7-x a real number?