#SUPPLEMENTARY ANGLE DEFINITION HOW TO#

Mark the degree of the angle made where two sides of the straight line intersect.Draw a straight line joining those two points, O and B.Now mark the point as B on the top circular part of a protractor, according to the preferred angle for example 40°.Now, place the protractor at that point, and its midpoint should touch the marked point O.

#SUPPLEMENTARY ANGLE DEFINITION HOW TO#

How to Construct an Angle (using protractor)

Wall clocks use the concept of angles to show time with hour and minute hands.

Artists use their measurement knowledge to sketch or create art pieces.

Carpenters use it to make equipment like doors, chairs, sofas, tables, etc.

Athletes use its concept in sports to enhance their performance.

Engineers construct buildings, bridges, houses, monuments, etc., using angle measurement.Here, ∠AXD and ∠CXD are supplementary angles. Supplementary angles: Angles that add up to 180° (a straight angle) are called supplementary angles.

Here, ∠BXC and ∠CXD are complementary angles. Complementary and Supplementary Angles:Ĭomplementary angles: Angles that add up to 90° (a right angle) are called complementary angles. Here, ∠ABC, ∠BCA and ∠CAB are interior angles.Įxterior angles: Exterior angles are the angles formed outside a shape, between any side of a shape and an extended adjacent side. Interior angles: Interior Angles are the angles formed within or inside a shape. A reflex angle measures between 180°- 360°.An angle measuring exactly 180° is a straight angle.A right angle precisely measures 90° at the vertex.An obtuse angle is between 90° and 180°.An acute angle measures less than 90° at the vertex.In the given diagram below, OA is the terminal side.īased on their measurements, here are the different types of angles: Terminal Side: The side up to which the angle measurement is done.Initial Side: Also known as the reference line, a straight line from where an angle is drawn.Arms: The two sides of the angle, joined at a common endpoint.Vertex: A vertex is a corner of an angle, a point where two lines/sides meet.Angles are measured in degrees (°) using a protractor.įor example, 45 degrees is represented as 45° Parts of Angles There are many daily life examples of an angle, such as cloth-hangers, arrowheads, scissors, partly opened doors, pyramids, edge of a table, edge of a ruler, etc.

The word angle comes from a Latin word named ‘angulus,’ meaning “corner.” The common point of contact is called the vertex of an angle. An angle is formed when two straight lines or rays meet at a common endpoint.

Supplementary angle definition