What is the angle measure that equals 1 hundredth of a right angle?

• A. Degree
• B. Radian
• C. Grad
• D. Arc

Answer: (C)

A hundredth of a right angle is equivalent to one hundredth of 90 degrees since a right angle measures 90 degrees. To find this measure, you would take 90 degrees and divide it by 100, resulting in 0.9 degrees. In terms of other measurement systems, the gradian (or gon) system represents angles differently, with a right angle being exactly 100 gradians. Therefore, 1 hundredth of a right angle in this system corresponds to 1 grad, making it a helpful conversion.

The grad system is often used in surveying and related fields where accuracy and ease of calculation are prioritized. Understanding these different units and their relationships is essential for surveyors as they conduct their work. Here, the gradian is particularly relevant, making it the correct choice for this question.