The first three terms of 2n-6

Having a hard time understanding this question (see attachment).

The table below lists recommended amounts of food to order for 10 party guests. how much of each food item should nathan and amanda order for a graduation party with 55 guests? use the table to answer. item amount fried chicken 16 pieces lasagna 7 pounds deli meats 1.8 pounds sliced cheese 1 and two fifths pounds bakery buns 1 dozen potato salad 2 pounds

Which angle has the same measure as the dehedral angle formed by the orange face and the purple rectangle