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📐 Classifying Angles and Shapes

Sort angles into right, acute, and obtuse, and name 2D shapes by counting their sides.

lessons

~20 min

to learn

🔢 Math

subject

Ages 6–12

level

Start the course →

What you’ll learn

Angles Big and SmallRecognise and sort right, acute, and obtuse angles.An angle is the amount of turn where two lines meet. A right angle is a perfect square corner of 90 degrees. An acute angle is smaller and sharper, less than 90 degrees, and an obtuse angle is wider and more open, between 90 and 180 degrees. Right angles hide in book corners, windows, and doors.
Sorting ShapesName 2D shapes by their number of sides, from triangles to hexagons.Flat shapes are named by how many sides they have: a triangle has 3, a quadrilateral has 4, a pentagon has 5, and a hexagon has 6. Every corner of a shape holds an angle. Shapes appear all over nature, like the hexagons in a honeycomb.
Putting It TogetherUse angle and shape facts together to describe and classify figures.Angles and shapes work together. A right angle measures 90 degrees, and any four-sided flat shape is a quadrilateral. Knowing the size of an angle and the number of sides lets you classify and describe almost any figure you see.

Questions this course answers

A right angle measures exactly…

A right angle is a perfect square corner, which measures 90 degrees.

An acute angle is…

An acute angle is sharper and smaller than a square corner, so it is less than 90 degrees.

Which of these is an obtuse angle?

An obtuse angle is wider than a square corner, like a laptop opened well past halfway.

How many sides does a quadrilateral have?

'Quad' means four, so a quadrilateral has 4 sides.

A honeycomb cell has six sides. What is that shape called?

A six-sided shape is a hexagon — the shape of every honeycomb cell.

Which shape has more sides, a pentagon or a triangle?

A pentagon has 5 sides and a triangle has 3, so a pentagon has more.

Grounded in trusted sources

Khan Academy Kids
BBC Bitesize — KS2 Maths
NRICH — University of Cambridge
Britannica Kids

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

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