👉 In mathematics, a "protractor" is a device used to measure angles. It consists of two parallel lines and an angle that can be measured by rotating them around one another. The protractor has a scale that indicates how far the line on the left will be from the line on the right as it rotates. The most common types of protracters are: 1. Linear Protractor: This type is used to measure angles between two parallel lines and can be rotated to measure angles between any