Tackles questions about different kinds of triangles with clear text and cheerful illustrations starring two friendly kids and one savvy robot.

"This book meets the Common Core Standards for mathematics for fifth grade: 5.G.3 & 4: classify two-dimensional figures into categories based on their properties"--Colophon. "This edition is available for distribution only through the school market." -- back cover. "First Scholastic printing, May 2014.