About This Set

Set 1 is for the first step of each type in this chapter: one tower and one angle, a shadow, a ladder or a kite string, plus a few short two-angle, speed and two-height questions. The marks usually go on small things: tan⁡30∘\tan 30^\circ and tan⁡60∘\tan 60^\circ swapped, so that h3h\sqrt{3} turns up where h3\frac{h}{\sqrt{3}} belongs, the line of sight given as the distance along the ground, or the observer's eye height left out. Take about 20 minutes; 20 or more right means you can move on to Practice Set 2.