The correct term Marla can use to classify each triangle formed by drawing a diagonal in a rhombus is C: isosceles.
Explanation:
- A rhombus has two pairs of opposite equal angles: two acute angles and two obtuse angles.
- When a diagonal is drawn in a rhombus, it divides the rhombus into two triangles.
- Each triangle will have two sides that are equal—these are the two sides of the rhombus that form the base of the triangle. This property means that each triangle is an isosceles triangle.
- Therefore, option C is the correct classification, as the triangles formed by the diagonal of a rhombus each have two equal sides.