Length and width are linear measurements of dimension. Length and width can be measured with a ruler. The units for dimension are centimeters. The abbreviation for centimeters is cm. 1. Click the to watch the videos. 2. Use the two rulers to measure the length and width at the same time. 3. Take a of the rock with the two rulers. 4. the of your rock with the two rulers. 5. Use the tool to write the length and width on the picture. Include the correct unit (cm). 6. a summary of this rock. Be sure to use ruler, length, width, and centimeters. 7. Click the green to save.