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Consider the dish to have vertex (0,0), hence the edge of the dish will have coordinates (1.75,1.1) as it is the width/2 and the given hight. Then you just substitute those values into the parabola equation x^2=4ay. And you get (1.75)^2=4xax1.1 3.0625=4.4a 0.6960...=a Therefore focus is...

I don't think question two was answered quite right. The idea with the inscribe right angle triangle is right but the hypotenuse is 2, the halved side with the chord is 1 and the side that forms the right angle with the chord is root 3 due to pythag theorem. So the equation of the circle that...