FOCUS QUESTION
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.
Pupils will watch a youtube video clip (Math Antics- perimeter) to review the topic for the day. (Perimeter). Formulate a working definition for ‘perimeter’.
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.
Tell what polygons are and the properties of every polygon. In sentences, tell the difference between regular and irregular polygons
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.
TASK 2
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