But of all the blocks designed to lie flat on a table or floor, have you ever seen any shaped like pentagons? People have been studying how to fit shapes together to make toys, floors, walls and ...

Then, in 1968, Richard Kershner of Johns Hopkins University discovered three more types of tessellating convex pentagons and claimed to have proved that no others existed. But Kershner’s paper left ...

Gardner reported that the classification of all tessellating convex polygons had been completed by a 1968 proof that claimed to have found the remaining convex pentagons that tile the plane. After ...

Triangles do this naturally, we read, but tessellating pentagons are harder to come by. When Rice was mulling over them in ...

Sponsor Message But it gets a lot more complicated when dealing with pentagons — specifically convex, or nonregular pentagons with the angles pointing outward. The number of convex pentagons is ...

So I looked for tessellating cookie cutters but found ... rectangles or some irregular pentagons. Some of the irregular pentagons were discovered by the late amateur mathematician Marjorie Rice ...