# Plane Geometric Shapes for Basic Class

**PLANE GEOMETRIC SHAPES **

**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 centre 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.