NCERT - 8 - Maths :: Understanding Quadrilaterals

Go To: NCERT-Mathematics-Grade 8

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Course Content / Subtopic list:

Polygons
Sum Of The Measure Of The Exterior Angles Of A Polygon
Kinds Of Quadrilaterals
Some Special Parallelograms

Lesson Plan

[Author - Kripa S]

Objective: Introduce Polygons, explain Quadrilaterals, types and properties

Subtopics to be covered:

- Identify polygons and classify based on number of sides

- Classify polygons (convex, concave, regular, irregular)

- Sum of angles of a polygon

- Types of Quadrilaterals and their properties (Trapezium, Kite, Parallelogram, Rhombus, Rectangle, Square)

Learning Outcome:

- Students can classify polygons and quadrilaterals

- Students can define types of quadrilaterals

Videos

[Author - Rishi Mazumdar]

https://hi.khanacademy.org/math/in-math-by-grade/in-eighth-grade-math/understanding-quadrilaterals-1 (Khan Academy)

Images

[Author - Kripa S]

http://www.rogersconnection.com/triangles/images/RCPoly.jpg (regular polygons)

http://www.aplustopper.com/wp-content/uploads/2016/10/what-is-a-quadrilateral-1.jpg (types of quadrilaterals)

http://www.skwirk.com/content/upload/images/Secondary/NSW/year_8/maths/solids_angles/tp3/ch3/tp3ch3_image3.jpg (properties of quadrilaterals)

Activities

[Author - Kripa S]

1. Make teams of 6 students. One team will explain what is interior and exterior of a closed curve (all students stand in a circle seeing inside for interior and outside for exterior). Another team will explain what is convex and concave polygon (they'll stand to make a polygon of that shape). One group will show the difference between regular and irregular polygon (the students will stand at equidistant positions, or near and far away).

2. Make two teams. One team will draw a polygon on board and other will guess what it is. Play for 10-15 times and add the score to find the winning team

Additional Aids

[Author - Amitesh Kulshreshtha]

https://drive.google.com/open?id=0BzNF2YyqQxJ-NVl1ejhacWl3S00

Transliteration

[Author - Fathima Nazar]

Term	Transliterated Term	Translated Term
quadrilateral	क़्वाड्रिलेटरल	चतुष्कोष
plane	प्लेन
surface	सर्फेस	सतह
curve	कर्व	वक्र
polygon	पॉलीगोन	बहुभुज
diagonal	डायगोनल	विकर्ण
convex	कॉन्वेक्स	उत्तल
concave	कॉनकेव	नतोदर
regular	रेगुलर	नियमित
irregular	इर्रेगुलर	अनियमित
trapezium	ट्रपीज़ियम	समलंब
kite	काइट	पतंग
parallelogram	पाराल्लेलोग्राम	चतुर्भुज
rectangle	रेक्टैंगल	आयत
rhombus	रोम्बस	विषमकोण
square	स्क्वायर	चौकोर
bisect	बाइसेक्ट	द्विविभाजित करना