Your students will love working these algebraic area and perimeter problems. The problems start easy "an equilateral triangle has a perimeter of 30a... find the length of a side" and become progressively more difficult. To advance in the circuit, students must find their answer. Great for review, guided notes, independent practice, cooperative learning, differentiated instruction -- you name it! My students don't leave their desks when the bell rings if they are working on a circuit!
The answer key is not included because the answers are embedded in the circuit. The only prep the teacher needs to do is work the circuit and then be prepared to facilitate and trouble-shoot as the students work.
This circuit can be found as part of a bundle of five circuits priced at $8; you may want to check that out before you purchase this! https://www.teacherspayteachers.com/Product/Circuit-Training-Algebra-I-Bundle-of-CCSS-PARCC-Inspired-problems-1603055