Introduction to Geometry Basics in Mathematics Course | Alison

Geometry in Mathematics

Improve your geometry skills with this comprehensive course on quadrilaterals, angles, intersecting lines, and more.

Free Course
This free online maths course will teach you about the different types of triangles, quadrilaterals, and polygons. In this course you will learn about how geometry deals with the measurement, properties, and relationships of points, lines, angles, surfaces, and solids. You will also study geometrical solids, transformation geometry, the different types of angles, how to measure them. Take this course today and conquer geometry once and for all!
  • Duration

    1.5-3 Hours
  • Assessment

  • Certification

  • Publisher






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Triangles are basic geometrical shapes that we meet everywhere around us. This course will first introduce you to different types of triangles. You will study equilateral, isosceles, acute-angled, right-angled, and obtuse-angled triangles. You will look into the different types of angles such as complementary angles, supplementary angles, and vertically opposite angles. You will also learn how to measure angles with protractors, explore angle sizes and sums in triangles, and study similar and congruent triangles.

Quadrilaterals are polygons with four edges and four vertices or corners. This course will discuss the different kinds of quadrilaterals and their properties. You will learn about equals sides, equal angles, and parallel lines. You will also look into the properties of a square, rectangle, trapezium, and more. This course will also cover polygons which are closed figures where the sides are all line segments. You will study regular polygons as well as the rational symmetry and line symmetry in polygons.

We are surrounded by space and things with different shapes and sizes. To be able to understand the wonder of the world's shapes and appreciate them, we need to have knowledge of spatial use. Geometry helps us in doing that because it provides the knowledge of how to deal with measurements and relationships of lines, angles, surfaces, and solids. So, check out the course today, and start learning something really interesting, in no time at all.

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Angle sizes and sums in triangles



Angle types

Corresponding angles

Geometrical solids

Introduction to polygons

Introduction to quadrilaterals


General triangles quiz

Introduction to triangles

Triangles - Similiarity and congruence


Learning Outcomes

After completing this course you will have a good understanding of equilateral, isosceles, scalene, acute-angled, right-angled, and obtuse-angled triangles. You will know how to calculate different types of angles in circles, rectangles and triangles.

You will gain a knowledge of quadrilaterals and the properties of a square, rectangle, parallelogram, rhombus, trapizium and kite. You will effectively learn the rotational symmetry of a polygon.

This course will teach you about geometrical solids, such as spheres, hemispheres, toruses and prisms. You will understand transformations such as reflections and rotations.


All Alison courses are free to enrol, study and complete. To successfully complete this Certificate course and become an Alison Graduate, you need to achieve 80% or higher in each course assessment. Once you have completed this Certificate course, you have the option to acquire an official Certificate, which is a great way to share your achievement with the world. Your Alison Certificate is:

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