Each group needs:

• yard or meter stick (or tape measure)
• sticks or dowels of varying lengths
• 5-6 textbooks or other stackable objects
• masking tape (to hold shapes forming the right triangle in place)
• Android device (phone or tablet) or iOS device (iPhone or iPad)
• clinometer app (available for free from Apple's iTunes store and Google's Play store) such as: Android clinometer: Clinometer (+bubble-level) by plaincode; iOS clinometer: Clinometer HD – bubble level and slope finder by plaincode
• Post-Activity Quiz, one per student