What is white’s best move? The lesson this week is that chess is often about finding the right angles. Reach Eric Morrow at ...

If your answer was the pair on the left and the pair on the right, then you are correct! The pair in the middle does not show an angle because the lines do not touch. You can check whether an ...

can be used to find a missing angle in a right-angled triangle when two sides are known. An understanding of the three trigonometric ratios and function machines is essential. For a right-angled ...