2 Chapter 1 Introduction to Statistical Quality Control, 5th Edition by Douglas C. Montgomery. 3Copyright (c) 2005 John Wiley & Sons, Inc.Chapter 1 Introduction to Statistical Quality Control, 5th Edition by Douglas C. Montgomery. 4Copyright (c) 2005 John Wiley & Sons, Inc. Learning Objectives.
Notice it always remains an equiangular triangle. The angles A,B and C always remain equal in measure. An equiangular triangle is a triangle where all three interior angles are equal in measure. Because the interior angles of any triangle always add up to 180Â°, each angle is always a third of that, or 60Â° The sides of an equiangular triangle are all the same length (congruent), and so an equiangular triangle is really the same thing as an equilateral triangle. See Equilateral Triangles. Properties
A right angle is an angle that measures 90Ë. It is also known as a 'quarter turn' because it is a quarter of a full turn, which measures 360Ë. A right angle is represented by a small square inside the angle.An acute angle is one that measures LESS than 90Ë. An obtuse angle is one that measures between 90Ë and 180Ë.A reflex angle is an angle that measures between 180Ë and 360Ë.ook at the inside angles of this shape. Mark the acute angles in red, the obtuse angles in blue and the reflex angle in green. To help your child put their knowledge of shapes and angles into practice download angles worksheets and other geometry worksheets.