For the given expression 31\E} The diameter of a tree was 'I1 in. During the following year. the circumference increased 2 in. About how much did the tree's diameter increase? {Leave your answer in terms of arc.) Q} A window is in the form of a rectangle surmounted by a semicircle. The rectangle is of clear glass, whereas the semicircle is of tinted glass that transmits only one-third as much light per unit are. as clear glass does. The total perimeter is fixed. Find the proportions of the window that will admit the most light. Neglect the thickness of the frame