Includes
 Chapters: 10
 Total Hours: 04:15 Hours
Features
 Full lifetime access
 Access on mobile
 Assignments
 Certificate of Completion
Overview
Course Description
Angle and its Measurement class 11 th
As you are studying Angles and Measurements class 11 th in this course, here are some highlighted points and terms you need to study.
When you have mastered the concept of points, lines, and planes, you can then think about what happens when two lines or rays meet at a point. This creates an angle between them.
We use angles throughout geometry to analyze shapes like polygons and polyhedrons. We also use angles to describe the behavior of lines, so we should become acquainted with angles, their terms, and how we measure and describe them. In this course, you will better understand angles and measurements.
Angle measurement Requirements :
 Protractor
 Setsquares
 Ruler
 Compass
 Divider
To Measure angle Protractor is used. For example, circular or semicircular protractors are usually made of transparent plastic, so they can be placed over shapes on a piece of paper and used to measure angles.
When studying angles and Measurements, these are the terms you need to understand:
What is an Angle?
An Angle is a figure which is formed by two rays or lines that shares a common endpoint in Plane Geometry.
An angle is a combination of two rays (halflines) with a common endpoint. The latter is known as the vertex of the angle and the rays as the sides, sometimes as the legs, and sometimes the arms of the angle.
How many types of Angle are there? Enlist them.
The different types of angles based on their measurements are:
Acute Angle  a point with is under 90 degrees
Right Angle  a point which is exactly 90 degrees.
Obtuse Angle  a point which is more than 90 degrees and less than 180 degrees.
Straight Angle  A point that is precisely 180 degrees.
The section starts with the rudiments. A point is a turn of a beam from its underlying point to its terminal point.
 Initial side
 Terminal side
 Positive angle
 Vertex
 Negative angle
Properties of Angles
Angles are measured in degrees, a measure of circularity or rotation.
One full rotation from the center of a circle is 360°, which would bring you back to your original position. As a result, a halfcircle is 180°, and a quartercircle, or right angle, is 90°.
How do Degrees and Radians differ from each other?
To describe or measure an angle, we usually use 'degrees' as the unit of measurement. You may find that angles are sometimes referred to in radians, however.
The radian is the standard unit of measurement for angles in the Standard International System (SI).
Our previous discussion mentioned that the full rotation of angles through a circular arc is 360°. Therefore, it is also equal to 2π radians, where π (pi) is a special number equaling (approximately) 3.142 (there is more about π on our page on Special Numbers and Concepts).
Radians are represented by 360/2* = 57.3°. Pi is also used to calculate areas and circumferences of circles and to calculate sphere volumes. For more information, review the course and understand it in detail. After completing this course you will be able to solve the maths chapter solution.
Zero angles:
The angle so formed is zero if the ray OA is no longer rotating, that is it is not rotating. The initial arm is then a terminal arm OB.
A rotation angle is formed when the initial ray OA coincides with the terminal ray OB after one complete rotation.
Straight angle:
A straight angle is formed when, after a rotation, the rays from the initial angle OA and the terminal angle OB face each other in opposite directions.
Right angle:
The right angle of onefourth of one rotation angle is also half of a straight angle. Four right angles make up one rotation angle.
Angle in a Quadrant:
If the terminal ray of a directed angle lies in a particular quadrant in standard position, then the angle is said to belong to that quadrant Angles
A quadrantal angle is a directed angle whose terminal ray lies along the Xaxis or the Yaxis of a standard position.
Coterminal angles:
In mathematics, coterminal angles are directed angles of different amounts of rotation with the same initial and terminal ray positions.
What you'll learn
 Degree to radian conversion
 Length of the arc
 Area of the sector
Requirements
 Anyone who wants to learn
 SSC passed
Course Content
10 Lessons  04:15 Hours
Types of Angles and measurements

Types of Angles
00:06:13 
Measure of an Angle  radian and degree
00:03:49 
How to convert degree to radian measurement and concept of clock
00:05:35 
Theorem  The radian so defined is independent of the radius
00:08:14
Exercise 1.1

Problems from exercise 1.1
01:56:37
Length of the Arc and Area of the Sector

Length of the Arc (S)
00:03:39 
Area of the Sector (A)
00:04:26
Exercise 1.2

Problems in Exercise 1.2
00:47:02
Miscellaneous Exercise  1

Miscellaneous exercise  Part 1  MCQs
00:20:07 
Miscellaneous Exercise  Part 2  Answer the following
00:40:00
About the instructor
Amit Patil
Instructor
1 Courses
B.E Mechanical Engineering from Mumbai University. 6 years of teaching experience for JEE, BITSAT, VITEEE, etc