Friday, October 30, 2020

Perimeter (Lesson 1) Mathematics Strand: Measurement

 FOCUS QUESTION

How do I calculate and use the various measurements around me?

SPECIFIC OBJS.
1. Calculate the perimeter of regular and irregular polygons.
2.  Calculate the measurement of one side of a polygon given the perimeter and the lengths of the other sides

CONTENT SUMMARY

Perimeter is the distance around a shape.

Polygons are multisided shapes. All polygons have sides, vertices and angles. Poly means many. They are closed shapes. Polygons are two dimensional or flat shapes. This means they must lie on the same plane.

A polygon is considered a regular polygon if it has equal sides and equal angles. On the other hand, irregular polygons do not have equal sides or equal angles.


ENGAGE

Pupils will watch a youtube video clip (Math Antics- perimeter) to review the topic for the day. (Perimeter). Formulate a working definition for ‘perimeter’.

EXPLORE

Students will watch youtube video clip (MathsAntics-Polygons) to glean information on polygons and the properties of polygons. They will name some of the polygons they are familiar with. Tell the difference between regular and irregular polygons.

Now let us identify the ones that are regular and the ones that are not.



Other video clip

EXPLAIN

Tell what polygons are and the properties of every polygon.  In sentences, tell the difference between regular and irregular polygons

EXTEND/ELABORATE

Examine the polygons projected on chalkboard. They will classify them as regular and irregular, based on their measurements.

Students I want you to read the problems below and try to decide on the answers. Be ready to explain how you arrived at the answers.

Eg, 

1.       The perimeter of a regular nonagon is 81 cm. Find the length of one of its side.

2.       The sides of an irregular polygon are 5cm, 6cm, 4cm, 8cm and x cm. If the perimeter is 29cm, what is the length of the missing side x?

Measure the lengths of polygons given by teacher and those taken by students. They will classify them as regular or irregular, and find their perimeter.

EVALUATE
TASK  1


  













  



















          TASK 2

       







TASK 3
(a)  A regular nonagon has a perimeter of 88cm. Find the lengths of one of its sides.
(b)i 4 sides of a polygon are 6cm, 9cm, 17cm, 4cm and x cm. What is the measurement of the side x?
    ii What is the name for this polygon? 


TASK 4






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