Question

1. what tool is crucial for basic geometric constructions?

compass
ruler only
calculator
protractor

Explanation:

A compass is essential for basic geometric constructions as it can be used to draw circles and arcs, and to transfer distances. A ruler alone is limited to drawing straight - lines and measuring lengths. A calculator is for numerical calculations and not for geometric construction. A protractor is mainly for measuring angles, not for basic construction elements like circles and equal - distance markings.

Answer:

A. Compass