1. The problem asks which two tools are used to make geometric constructions. 2. Geometric constructions typically involve creating shapes, angles, and lines using precise tools. 3. The common tools for constructions are: - Straightedge: used to draw straight lines. - Compass: used to draw arcs and circles. 4. Other tools like protractors measure angles, rulers measure lengths, calculators perform calculations, and strings can be used for rough measurements but are not standard construction tools. 5. Therefore, the two correct tools for constructions are **Straightedge** and **Compass**. Final answer: b. Straightedge and f. Compass