1-2sinA*cosA/2=sin^2(pi/4-A)​

1) 2/5

2) zero=0/1

3) zero=0/2

4) -4/5

5) undefined=3/0

can someone me: the midsegment through the legs of an isosceles triangle is 4 in. find the sides of the triangle if its perimeter is 20 in. ,   and point g is the centroid of the right △abc with hypotenuse ab=18 in. find cg.

i belive the biggest ratio would be 18: correct me if im wrong