A straight line is to a ruler as an angle is to: A. cosine B. two rulers C. protractor D. calculator

"A protractor is a simple measuring instrument that is used to measure angles. A common protractor is in the shape of a semicircle with an inner scale and an outer scale and with markings from 0 degrees and 180 degrees on it."

What is a ruler?

"A math ruler is used to measure the length in both metric and customary units. The rulers are marked with standard distance in centimeters in the top and inches in the bottom and the intervals in the ruler are called hash marks."

A straight line is to a ruler and an angle is to protractor.

A protractor is a simple measuring instrument that is used to measure angles. A common protractor is in the shape of a semicircle with an inner scale and an outer scale and with markings from 0 degrees and 180 degrees on it.

Cosine is a trigonometric function that for an acute angle is the ratio between the leg adjacent to the angle when it is considered part of a right triangle and the hypotenuse.

A math ruler is used to measure the length in both metric and customary units. The rulers are marked with standard distance in centimeters in the top and inches in the bottom and the intervals in the ruler are called hash marks.

A calculator is a device that performs arithmetic operations on numbers. The simplest calculators can do only addition, subtraction, multiplication, and division.

Hence, A straight line is to a ruler and an angle is to protractor.

Option (C) is correct.

Learn more about protractor here

https://brainly.com/question/1675387

#SPJ2