The best way to measure an angle is to **use a protractor**. To do this, you’ll start by lining up one ray along the 0-degree line on the protractor. Then, line up the vertex with the midpoint of the protractor. Follow the second ray to determine the angle’s measurement to the nearest degree.

## How do you find the measure of an angle without a protractor?

Use the ruler to measure the exact distance between the two points on the angle. Label this distance “e.” Input the values of d and e into the formula ” Angle measure = 2 x arcsin (0.5 x e/d).” (In other words, the angle measure is equal to two times the inverse sine of half the ratio between the lengths e and d.)

## How do you find the measure of an angle with only one angle?

Use the sine rule if given only one angle and two lengths of a triangle. The formula is sin A/a = sin B/b, where “A” and “B” are angles and “a” and “b” are the lengths of the sides opposite these angles, respectively.

## What is angle formula?

FAQs on Angles Formulas Angles Formulas at the center of a circle can be expressed as, Central angle, θ = (Arc length × 360º)/(2πr) degrees or Central angle, θ = Arc length/r radians, where r is the radius of the circle.