Question

How can the area of this triangle be determined by forming a rectangle?

Select from the drop-down menus to correctly complete the statéments.
Copy and rotate the triangle and place it next to the existing
triangle to form a rectangle. The length of the rectangle is
Choose... units. The width of the rectangle is
Choose... v units. The area of the rectangle is
Choose... v square units.
The area of the triangle is half the area of the rectangle, so the
area of the triangle is Choose... square units.

Answer 1

The length of the rectangle is 5 units. The width of the rectangle is 4 units. The area of the rectangle is 20 square units. The area of the triangle is half the area of the rectangle, so the area of the triangle is 10 square units.