Geometry Is as Easy as Pie

“Why use pie charts to demonstrate basic principles of geometry when actual pies will do? In her equally scrumptious follow-up to Geology Is a Piece of Cake (2017), Coppens once again keeps the focus on the food—linking introductions to seven fundamental concepts of geometry, including “Symmetry,” “Tessellations,” and “Angles,” by quickly turning each topic pie-ward: “How does rotational symmetry relate to pie?” “How do polygons relate to pie?” “How does Pi (π) relate to pie?” The illustrations offer a similarly enlightening (not to mention mouthwatering) mix of simple diagrams and color photos (most by the author herself) of beautifully decorated pies, sliced or whole as required for demonstrative purposes. Clear, simple line diagrams complement these photos and ably help to integrate the content. A discussion of right, complementary, acute, and obtuse angles (and more) yields explorations of both equitable slicing and relative appetite size. Recipes? Of course…eight in all, ranging from appetizer-sized samosas and a savory quiche to a butterscotch pie and a lattice-topped apple masterpiece (demonstrating parallel and perpendicular lines, natch). All come with detailed instructions, though for all but the final array of miniature berry pies, pre-made dough or crusts are recommended. The author closes with 20 challenging review questions (about geometry, but cast in pie-centric language) and a final photo gallery labeled “Just Desserts” to drool over. A cute angle any way you slice it.”
– Kirkus Reviews