Right Angles: Right angles measure exactly 90 degrees.They are often used in construction and carpentry, as well as in mathematics and geometry.For example, it takes a right angle to form a square or rectangle. Farago, Francis T; Curtis (1994). Handbook of Dimensional Measurement. Industrial Press Inc. p.580. ISBN 0-8311-3053-9. Solution: Place the center of the protractor at vertex B with either AB or BC coinciding with the baseline and note the reading. You will get a 90° angle.

So whether you want to measure an angle, measure the degree, or compare two angles, the online protractor is the perfect tool for the job! Measuring angles with the online protractor If the line doesn’t extend past the protractor’s arc, lengthen it with a ruler. Or, line the edge of a piece of paper along the line. Example 1: Find the measure of each angle of an equilateral triangle with the help of a protractor. The make-up of the Constructing Triangles resource has been tailored to ensure it functions at a high level in a home learning environment. This means that the explanatory information given, the tasks provided and detailed answers laid out in the resource have been made to foster a healthy attitude to independent learning.A bevel protractor is a graduated circular protractor with one pivoted arm; used for measuring or marking off angles. Sometimes Vernier scales are attached to give more precise readings. It has wide application in architectural and mechanical drawing, although its use is decreasing with the availability of modern drawing software or CAD. Now, we can measure the angle of anything around us anytime, anywhere using our laptop, computer, tablet or smartphone. The first is a Side, Angle, Side (SAS) construction where two sides and the angle between them is known.

Solution: Align the protractor with the vertices of △ABC. Note the angle obtained in each case. You will find that all the angles of the equilateral triangle measure 60°.

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There are many different types of angles and each type has its own unique properties.Here are some of the most common types of angles: Take a protractor and place it such that its center point coincides with point A and its baseline coincides with AB. Move the on-screen protractor using (desktop) left mouse drag or (tablet) single finger touch and drag. Protractor is highlighted in green when moving.

center of the protractor at the vertex of our angle. And now, I want to rotate it. There we go. And this looks like roughly More recently in the twenty-first century, smartphone application developers have created mobile applications that provide the functions of a goniometer. These applications (such as Knee Goniometer and Goniometer Pro) use the accelerometers in phones to calculate joint angles. Recent research supports these applications and their devices as reliable and valid tools with as much accuracy as a universal goniometer. [8] [9] [10] Goniophotometers measure the spatial distribution of light visible to the human eye (often luminous intensity) at specific angular positions, usually covering all spherical angles. Protractors typically label measurements in 10s, but between each number are little lines that represent 1°. If your ray falls in between 2 whole numbers, like 50° and 60°, just count the lines to find your angle’s exact measurement. [6] X Research sourceFollow the other ray up to the measurements on the protractor's arc. Use the scale measurements that are increasing in the direction that your angle is opening up in. If it’s an acute angle, make sure you’re looking at the measurements that are less than 90°. If your angle is obtuse, use the scale with measurements greater than 90°. The number that the ray passes through is your angle’s measurement in degrees. [5] X Research source place it so that one side of the angle lines up with one of the zeros, and read that set of numbers. The bevel protractor is used to establish and test angles to very close tolerances. It reads to 5 arcminutes (5′ or 1 / 12°) and can measure angles from 0° to 360°.

Kuegler, P.; Wurzer, P.; Tuca, A.; etal. (2015). "Goniometer-apps in hand surgery and their applicability in daily clinical practice". Safety in Health. 1: 11. doi: 10.1186/s40886-015-0003-4.The second is an Angle, Side, Angle (ASA) construction where two angles and the side between them is known. there's two ways to do that. You could do this. You could do just this. But this isn't too helpful, Angles Glossary Acute Angle Any angle that is less than 90° Right Angle An angle that is 90° Obtuse Angle An angle greater than 90° but less than 180° Straight Angle An angle of 180° which makes a straight line Reflex Angle An angle greater than 180° Related activities Obtuse Angles: Obtuse angles measure more than 90 degrees but less than 180 degrees.They are often used in architecture and engineering, as well as in art and design.For example, an obtuse angle can be used to create a sense of depth in a painting.