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📐 Measuring and Drawing Angles

Use a protractor to measure and draw angles, and name acute, right and obtuse angles.

lessons

~30 min

to learn

🔢 Math

subject

Ages 6–12

level

Start the course →

What you’ll learn

Angles Are TurnsUnderstand that an angle is an amount of turn measured in degrees, and name acute, right and obtuse angles.An angle is the turn between two lines meeting at a point, measured in degrees (°). A full turn is 360°, a half turn 180° and a quarter turn 90°. Angles under 90° are acute, exactly 90° are right angles, and between 90° and 180° are obtuse.
Using a ProtractorUse a protractor to measure angles from 0° to 180°, choosing the correct scale.A protractor is a semicircle that measures angles from 0° to 180°. Put its centre on the vertex, line the 0° along one arm, and read where the other arm crosses. Its two scales share the same marks, so always start from the 0 on your arm.
Drawing Your Own AnglesDraw angles of a given size accurately with a protractor and ruler, and order angles by size.To draw an angle, draw one arm, place the protractor's centre on the vertex, mark the target degree, and join the vertex to the dot. Angles can be ordered by how open they are, from a sharp 20° up to a nearly straight 160°.

Questions this course answers

A quarter turn is an angle of how many degrees?

A quarter of a full 360° turn is 90° — a right angle.

Which of these is an acute angle?

Acute angles are smaller than 90°, and 35° fits that.

A 130° angle belongs in which family?

130° is bigger than 90° but smaller than 180°, so it is obtuse.

What is the largest angle a normal protractor can measure?

A protractor is a half circle, so it measures from 0° up to 180°.

Before you read an angle, the centre of the protractor should sit on the...

The centre hole must sit on the vertex where the two arms meet.

A protractor has two rows of numbers. You should start counting from the 0 that is...

Start from the 0 sitting on one arm so you follow the correct scale.

Grounded in trusted sources

Khan Academy Kids
BBC Bitesize KS2 Maths
NRICH Maths (Cambridge)
Britannica Kids
National Council of Teachers of Mathematics

Every Wunder lesson is built from real, reputable sources — never invented.

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