Difference between revisions of "Complementary angles"

Latest revision as of 16:11, 30 October 2019

Complementary angles are two angles with a sum of 90°. A common case is when they form a right angle.

Objectives

Introduce children to concept of complementary angles

Estimated Time

30 minutes

Prerequisites/Instructions, prior preparations, if any

Prior knowledge of point, lines, angles

Materials/ Resources needed

Digital : Computer, geogebra application, projector.
Non digital : Worksheet and pencil.
Geogebra files : Complementary angles.ggb

Download this geogebra file from this link.

Process (How to do the activity)

Prior hands on activity (optional – children can use news paper strips to make angles and place them together and notice if the resulting angle formed is a right angle).
Students should be able to identify the types of angles in the file
Let them attempt to join the two angles -They may try by coinciding different points or lines.
Ask about the angle formed by joining the two angles?
Challenge them to find another way to make a right angle using the two existing angles.
Interchanging the position of the two angles – ask what they notice.
If one angle is changed will the two together again form a complementary angle.
Children can be asked to make note of the angle measures for different angles work sheet
Observations made with angles seen so far.
Ask if the angles have to be adjacent to be complementary pairs
Record the values of the two angles and their sum in the worksheet

Sl No.	Value of slider α	Angle ABC	Angle DEF	Sum Angle ABC + Angle DEF	Is angle ABC complement of angle DEF
.

Evaluation at the end of the activity

What are complementary pair of angles?
Is it required for the pair of angles to be adjacent to be complementary?
What types of angles form complementary pair?

@@ Line 1: / Line 1: @@
-===Name of the activity===
+Complementary angles are two angles with a sum of 90°. A common case is when they form a right angle.
-Brief blurb describing what the activity.  If this has been borrowed from some external web site (for example, a non OER or OER site which had this idea and based on which the activity was developed)
 === Objectives ===
-Content objectives  - what content areas
+Introduce children to concept of complementary angles
-Skill objectives - what specific skills
-Classroom objectives - to demo peer learning, to make a classroom resource, etc -
-All these kinds of objectives need not be there for every activity.  And no need to list them as different headings.  This is only for our reference when we are developing activities.
 ===Estimated Time===
+minutes
 === Prerequisites/Instructions, prior preparations, if any ===
+Prior knowledge of point, lines, angles
 ===Materials/ Resources needed===
+* Digital : Computer, geogebra application, projector.
+* Non digital : Worksheet and pencil.
+* Geogebra files : '''[https://ggbm.at/wwege3ad Complementary angles.ggb]'''
+{{Geogebra|wwege3ad}}
 ===Process (How to do the activity)===
-How to do the different steps of the activity?
+* Prior hands on activity (optional – children can use  news paper strips to make angles and place them together and notice if the resulting angle formed is a right angle)'''.'''
+* Students should be able to identify the types of angles in the file
-What kinds of questions you can ask for that activity
+* Let them attempt to join the two angles -They may try by coinciding different points or lines.
+* Ask about the angle formed by joining the two angles?
-What are the student follow-up activities/ questions you can give?
+* Challenge them to find another way to make a right angle using the two existing angles.
+* Interchanging the position of the two angles – ask what they notice.
+* If one angle is changed will the two together again form a complementary angle.
+* Children can be asked to make note of the angle measures for different angles work sheet
+* Observations made with angles seen so far.
+* Ask if the angles have to be adjacent to be complementary pairs
+* Record the values of the two angles and their sum in the worksheet
+: {| class="wikitable"
+|Sl No.
+|Value of slider α
+|Angle ABC
+|Angle DEF
+|Sum
-Categories:  (Subject) (Topic) (Sub-concept/topic) (Class 6) (Resource format)
+Angle ABC + Angle DEF
+|Is angle ABC complement  of angle DEF
+|-
+|.
+|
+|
+|
+|
+|
+|}
+* '''Evaluation at the end of the	activity'''
+# What are complementary pair of	angles?
+# Is it required for the pair of	angles to be adjacent to be complementary?
+# What types of angles form	complementary pair?
-Example -  (Mathematics) (Triangle) (Area) (Perimeter) (Class 6) (Class 8) (Geogebra) (Video)
+[[Category:Lines and Angles]]