Area formulae measure flat surfaces. Rectangle area is length × breadth, and triangle area is half of base × height. The other two options mix up volume, surface area, or circumference. Since this is a multi-answer question, check each option separately instead of looking for only one answer. A statement is correct only when both the formula and the unit idea match the measurement being discussed. The correct choices are Triangle: 1/2 × base × height, Rectangle: length × breadth.