Regular and Irregular Polygons | Grade 7 | Matatag Curriculum | Quarter 1 |

Summary

In this educational video, the instructor, JMJ, introduces the concept of polygons, focusing on regular and irregular polygons with 5, 8, and 10 sides. The video clarifies what makes a figure a polygon and distinguishes between regular polygons, where all sides and angles are equal, and irregular ones, where they are not. The instructor demonstrates how to draw regular polygons using a protractor and ruler, providing examples of regular pentagons, hexagons, octagons, and decagons, as well as their irregular counterparts. The lesson aims to help students understand the fundamental properties of polygons and their variations.

Takeaways

• 📐 A polygon is a closed figure with straight sides in a two-dimensional plane.
• 🔍 The first illustration is not a polygon due to the presence of a curved side.
• 🔎 The second illustration is not a polygon as it is an open figure missing a side.
• 🎯 The third illustration is a polygon because it is closed and made up of straight line segments.
• 🔑 A regular polygon has all sides and angles of equal measure, while an irregular polygon does not.
• 📝 Regular polygons can be drawn using a protractor and ruler to ensure equal sides and angles.
• 📈 A pentagon is a polygon with five sides, and a regular pentagon has five equal sides and angles.
• 🔶 A hexagon has six sides, and a regular hexagon has six equal sides and angles.
• 🔟 An octagon has eight sides, and a regular octagon has eight equal sides and equal interior angles.
• 📊 A decagon has ten sides, and a regular decagon has ten equal sides with congruent interior angles.
• 🚫 Irregular polygons, such as the irregular pentagon and hexagon, have sides and angles that are not equal.
• 👋 The video concludes with an invitation to like, share, and subscribe to help more students learn about polygons.

Q & A

What is a polygon?

A polygon is a closed figure made up of line segments, not curves, in a two-dimensional plane.

Why is illustration number one not considered a polygon?

Illustration number one is not a polygon because it has a curve side, and polygons are made up of line segments only.

Why can illustration number two not be classified as a polygon?

Illustration number two is not a polygon because it is an open figure, lacking a complete line segment to form a closed shape.

What is the correct answer to identify a polygon in the given illustrations?

The correct answer is number three, as it is a closed figure made up of line segments.

What is a regular polygon?

A regular polygon is a polygon where all sides are equal in length and all interior angles are of equal measure.

What is an irregular polygon?

An irregular polygon is a polygon that does not have equal sides and equal angles.

How many sides does a pentagon have?

A pentagon has five sides.

What is a hexagon?

A hexagon is a polygon with six sides.

What distinguishes a regular pentagon from an irregular pentagon?

A regular pentagon has five equal sides and five equal angles, while an irregular pentagon does not have equal sides or angles.

How many sides does an octagon have?

An octagon has eight sides.

How many sides does a decagon have?

A decagon has ten sides.

What is the difference between a regular octagon and an irregular octagon?

A regular octagon has eight equal sides and eight equal interior angles, whereas an irregular octagon has sides and angles that are not equal.

What tool did the teacher use to ensure the sides and angles of the polygons were equal?

The teacher used a protractor and a ruler to ensure that the polygons had equal sides and angles.

How can one learn to draw regular polygons?

One can learn to draw regular polygons by following step-by-step instructions, which can be found in the video class linked in the description.