Bruce has a square and a rectangle.
He cuts the rectangle along the dotted line as shown below.
Bryce then joins these 3 pieces to make a parallelogram.
Which of these calculations could Bryce use to find the area of the parallelogram?
- \(3\ \text{cm}\times 6\ \text{cm}\)
- \(6\ \text{cm}\times 9\ \text{cm}\)
- \(12\ \text{cm}\times 6\ \text{cm}\)
- \(21\ \text{cm}\times 3\ \text{cm}\)