# Perimeter and Surface Area

Henri Picciotto

• In addition to the "like terms" practice, these activities provide a welcome algebra-geometry connection.
• In particular, working with concrete materials is far more effective than looking at textbook illustrations when introducing surface area.
• And here's a bonus challenge. Using three blocks (not necessarily all different), make a Lab Gear building for each of these surface areas:
• 2x^2+12xy
• 6y^2+8xy
• 6xy+8x^2