Sir Cumference and the Isle of Immeter

When young Per visits her uncle Sir Cumference and his family, she learns how to play the game, "Inners and Edges." After she finds a clue linking the game to the mysterious castle on the island of Immeter. There, Per and her cousin Radius must solve a series of puzzles including: figuring out how to find the perimeter and area of a circle in order to unlock the island's secret. But can they solve Immeter's secret before the sea serpent finds them? Math Concepts: area & perimeter of rectangle, area & circumference of circle, using straight lines to measure curves. 32 pages.