In total, the boy had 12 tomatoes, but 9 got smashed. We can set this up as a subtraction problem, with 12 as the total and 9 being subtracted. 12 - 9 is a simple problem, which equals 3 because 9 + 3 is equal to 12.
<span>The sum of angles CAD and DAB is 180 degrees. This is because they are all on a straight line (because points CAB are colinear) and angles on a straight line add up to 180 degrees.</span>
