## Detailed description

Square of side length 1, diagonal length √2. Base of square is extended to form a number line marked 0, 1, 2. An arc projects the diagonal length onto the number line, showing that √2 is between 1 and 2.

Square of side length 1, diagonal length √2. Base of square is extended to form a number line marked 0, 1, 2. An arc projects the diagonal length onto the number line, showing that √2 is between 1 and 2.