Have you ever wondered how to measure your pizza, or how much ice cream is in your ice-cream cone? Basic principles of geometry, including measuring two-dimensional and three-dimensional shapes, attributes of various shapes, and formulas for finding area and volume, are explored through informative and engaging text in this newest addition to the How Do series. The How Do series is a great introduction to various STEM topics, each written in a format that encourages audiences to ask questions and guess the answers before exploring the science behind them.