If your child is studying geometry and enjoys art, then they might like this free download, Geometry in Art. It was put together by Hilton Andrade de Mello. Hilton Andrade de Mello is a graduate of the Federal University of Rio de Janeiro, Brazil, from which he received his electrical/electronics engineering degree, and his Nuclear Engineering degree, both in 1962.
This book shows how geometric forms have been and continue to be used in the Arts and in Architecture, and how they appear in Nature.
The download is 114 pages. The last two pages contain links for the artwork, artists, miscellaneous, museums, cultural centers, encyclopedias, and geometry software.