Abrand new filled can of chicken broth is 10 cm tall and has a radius of 10 cm. mishka uses some of the broth to cook and now the broth left in the can is 6cm high. how much broth did mishka use?

Here is their argument. given the obtuse angle x, we make a quadrilateral abcd with ∠dab = x, and ∠abc = 90◦, and ad = bc. say the perpendicular bisector to dc meets the perpendicular bisector to ab at p. then pa = pb and pc = pd. so the triangles pad and pbc have equal sides and are congruent. thus ∠pad = ∠pbc. but pab is isosceles, hence ∠pab = ∠pba. subtracting, gives x = ∠pad−∠pab = ∠pbc −∠pba = 90◦. this is a preposterous conclusion – just where is the mistake in the "proof" and why does the argument break down there?

Is it true or false i’m trying to pass this test so i can leave school

Sum is 17 and their difference is 3