# Plane Geometric Shapes for Basic Class

Last Updated on September 8, 2020 by Alabi M. S.

## CIRCLE

Circle is a closed curve with all points the same distance from a center point

Characteristics of Circle

• Diameter – distance across a circle through the circle is the diameter.
• Radius – the distance from the center to any point on the circle.
• Circumference – distance round a circle.

Relationship between Diameter and Radius

• Diameter – twice of a radius.
• Radius – half of a diameter.

## TRIANGLES

Triangle is a 3 sided plane figure or shape.

Characteristics of Triangle

• 3 sides
• 3 angles
• The sum of the inside angels equal to 180.

Types of Triangles

• Equilateral Triangle – 3 equal sides and 3 equal angles.
• Isosceles Triangle – 2 equal sides and 2 equal angles.
• Scalene Triangle – none of its sides or angles are equal.

## QUADRILATERALS

Quadrilateral is a four sided plane figure or shape.

Characteristics of Quadrilateral

• 4 sides
• 4 angles
• The sum of the inside angels equal to 360º.

Types of Quadrilateral

• Square – 4 equal sides and 4 equal angles – all angles are at right angles, that’s 90º each.
• Rectangle – 2 equal opposite sides and 4 equal angles – all angles are at right angles, that’s 90º each.
• Rhombus – opposite and angles sides are equal.
• Parallelogram – 2 equal opposite sides and 4 equal angles. Square, rectangle and rhombus are parallelogram.
• Trapezium or Trapezoid – 2 parallel sides.

## PENTAGON

Pentagon is a five sided figure or shapes.

Characteristics of Pentagon

• 5 equal sides and 5 equal angles.
• Sum of angle is 540º.
• The sides and angles of a regular pentagon are equal.

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