The rotating 180-degree head locks the rule at a desired angle or tells you the exact angle of an existing bevel. Geometrical tools, D shape scale vector Triangle ruler, protractor, centimeter, measurement, tape, length, tool vector icon vector Protractors and tools. Is there a relationship between the measurement of angle 1 and angle 2? How about between angle 1 and angle 3? Is the relationship also true between angle 2 and angle 3? 2. Starrett’s cast-iron protractor head with chromed-steel rule, on the market since 1908, is a classic machinist’s tool for anyone who values precise layout marks. Find measurement of angles 2 and 3 when the measurement of angle 1 is: 30⁰ 45° 90° 120° 180° Questions: 1. Given that both sides of the angle measures 2 inches. Find measurement of angles 2 and 3 when the measurement of angle 1 is: Angle 1: Angle 2: Angle 3: Angle 3 Angle 1: Angle 2: Angle 3: 30° 45° 90⁰ 120° 180° 2. Given that Side 1 is 2 inches and Side 2 is 3 inches. Write your answer on a separate sheet Side 2 Angle 1 Angle 2 Side 1 1. Supply the measurements of the angle 2 and angle 3 in each table. The protractor scale on the triangle can aid in drawing a bearing line on a chart, and the 90 angle is helpful when determining lines of position. Extending the triangle Materials needed: protractor, ruler, paper and pencil/pen Directions: Using measuring tools extend side 1 of the triangles formed in the activity Measuring Angles and Sides as illustrated below. A triangle protractor is called a nautical protractor which is used by seamen for navigational charts.
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