Students will see a proof of the following theorem: If \(ABCD\) is a rhombus, then its area is equal to \((1/2) \cdot AC \cdot BD.\)
Proof: Rhombus area by Khan Academy
A diagram of \(ABCD\) with the diagonals drawn would be nice.
Conclude by giving your students these challenges:
- Cryptarithms by NRICH
- Coordinate Patterns by NRICH
- Factor Track by NRICH
- 2020 AMC 8, Problem 21
- Change for a Dollar by Pierce School: Problem / Solution