A tennis ball is served from directly above the baseline (assume the ball travels in a straight line). What is the minimum height that the ball can be hit at to ensure it lands in the service area?
If the sides of the triangle in the diagram are 3, 4 and 5, what is the area of the shaded square?
Draw all the possible distinct triangles on a 4 x 4 dotty grid. Convince me that you have all possible triangles.