MTH2: INTERIOR ANGLES SUM

This unit is about the interior angle sum measures and how to calculate the sum of interior angles.

INTERIOR ANGLE SUM

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Hexagon

Draw a regular Hexagon inside a circle of radius 5 cm.

Quadrilaterals

These are four sided polygon

E.g Rhombus , square , rectangle

A Rhombus : construct a Rhombus

Give that one of its diagonals is 6cm

A VIDEO BELOW SHOWING HOW TO CALCULATE THE INTERIOR ANGLE SUM OF A TRIANGLE

Properties

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POLYGON AND POLYHEDRA

Definitions:

A polygon

This is a closed plane figure with straight line.

A regular polygon

This is a polygon with all its sides equal and all angles equal.

A convex polygon

A polygon is convex if any of its sides when extended doesn’t cross other sides of the polygon.

e.g

A video showing How to Find the Sum of Interior Angles of a Polygon

A SQUARE

Construct a square ABCD of side 5cm

  • All sides equal

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  1. Measure length of BA and CA
  1. Name the triangle
  2. Measure angle ACB and length BC
  1. Construct a triangle ABC with all sides 8cm

What do you notice about the angle.

Sketch

It is an equilateral triangle with all sides equal.

THE TRIANGLE

Definition:

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ASSIGNMENT : INTERIOR ANGLES SUM ASSIGNMENT MARKS : 10  DURATION : 50 minutes

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