If the diameter of a circle is 14in what is the circles radius?

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?

If f(x)=x^3 and g(x)=2x+7 when g(x)=-5

10 points? me . its important ‼️‼️