There are 12 types of pentominoes. Find the other 11 types of pentominoes. Find all different rectangles with integer sides greater than 2 whose area equals 60. You are allowed to rotate and reflect the pieces to tile the rectangles. It is then cut into cubes with sides 1 unit long.
Rangefinders are like binoculars.
You look through the viewfinder on the back with one eye. You see two pictures of the animal. You turn something until the two images are on top of each other. The rangefinder tells you how far away the animal is. January 1997 - Overlapping polygons.