Sometimes Ballparking can even help on geometry questions. Not all pictures are drawn to scale, so don't assume the figure is exact. You can, however, use what the question tells you about the figure to estimate angles, line lengths, areas, and points on graphs in the xy-plane.If the previous figure is drawn to scale, the angle with measurement B appears to be acute, making (A) or (B) a good bet. The question says the hexagon is "regular," which means that all the interior angles have the same measure, and the drawing looks like this is the case. Start by marking the angle that is A∘ as 120∘ on the figure. This angle looks like 120∘, so B can't possibly equal 90∘ or 140∘. Eliminate (C) and (D). To find the exact value of B, you need to find the measure of the angle opposite it, which is one of the angles from the triangle. The angle of the upper-left corner of the triangle is formed by drawing a straight line from the angle that is A∘, or 120∘. There are 180∘ in a straight line, so the upper-left corner of the triangle measures 180∘−120∘=60∘. Label this measure on the figure as well. The fact that the hexagon is regular means that all the interior angles are 120∘, so label the angle next to the bottom corner of the triangle. Since this corner of the triangle is formed in the same way as the upperleft corner, the bottom corner also measures 60∘. Label it. There are 180∘ in a triangle, so the upper-right angle is also 60∘. The angle measuring B∘ is opposite this, so B is 60∘ and (B) is correct.