Practise mathematics online - the new site of Mathefritz

# Calculate angle measurement online ∠ Angle interactive exercises

## Calculate angle measurement online ∠ Measure + draw angle Learn how to measure angles, calculate angles online, draw angles and measure angles on this page. There are also interactive exercises and worksheets below!

## Angle interactive exercises

Calculate angles online - Draw angles online.

The interactive angle - the blue angle is the angle that can be changed with +/-. Try it out!

Optimal with PC or tablet!

Angle in degrees
°
°
°

## What is an angle?

What is an angle?

An angle indicates the inclination of two lines meeting at a point.

This inclination is expressed in degrees (°). We use small Greek letters to designate an angle:

α: Alpha, β: Beta, γ: Gamma, δ: Delta, ε: Epsilon

Example: acute angle

Step 1:

Place the triangle with the zero point of the base line (centre) at the apex!

Step 2:

Read from the lower leg of the angle (at the base line) from zero in positive direction. Here in the example between 30° and 40° exactly at 35°.

Example: obtuse angle

Proceed in the same way as for the acute angle! When reading, however, pay attention to the correct direction and to the size of the value!

Here in the example exactly 140°.

Example: Overshot angle

Check whether there is an obtuse angle.

In this case we always measure the opposite angle and calculate the angle we are looking for by calculating 360° minus the opposite angle.

Here:

Counter angle = 40°, angle sought = 360° - 40° = 320°!

## The different types of angles

In order to be able to measure and draw angles correctly, it is very important to know the types of angles exactly!

Pointed angle $$0< \alpha < 90°$$

Right angle $$\alpha = 90°$$

Blunt angle $$90 < \alpha < 180°$$

Stretched angle $$\alpha = 180°$$

Overshot angle $$180 < \alpha < 360°$$

Full angle 360 $$\alpha = 360°$$

## Measuring angles - The learning video from Mathefritz

Measure angle

Learn how to measure an angle. In a short video we show you how to use the set square. Measure angles correctly!

## Drawing angles - The learning video from Mathefritz

Draw angles

Learn how to draw an angle. In a short video we show you how to use the set square. Draw angles correctly!

## Angle online and interactive - the materials as a PDF

The Infoposter - Measuring angles

Calculating angles online - interactive exercises