Classifying angles as acute (< 90°), right (= 90°), obtuse (90°-180°), straight (= 180°), or reflex (> 180°).
Where your child meets this in real life: Describing angles in everyday objects, navigation, or sports
SEAGReady breaks classify angles into 3 steps, taught in order so each skill builds on the last.
Identify right angles (90°) as the 'corner' or 'L-shape' angle that forms a square corner
Classify angles as acute (less than 90°) or obtuse (between 90° and 180°) by comparing to a right angle
Recognise straight angles (exactly 180°) and reflex angles (between 180° and 360°)
Three free sample questions from our classify angles course. Every question comes with a full explanation, and hints that guide without giving the answer away.
Aoife looks at the corner of her desk. Is this corner a right angle?
Answer: A. Yes, it is exactly 90 degrees
A desk corner forms a perfect 'L' shape. This is exactly 90 degrees. A 90 degree angle is called a right angle. Yes, the desk corner is a right angle.
Stuck? Start here: A right angle makes a perfect 'L' shape or square corner.
Oisin measures an angle of 60 degrees. Is this angle acute or obtuse?
Answer: A. Acute
Compare to the right angle (90 degrees): 60 < 90 An angle less than 90 degrees is called acute. So 60 degrees is an acute angle.
Stuck? Start here: Compare 60 degrees to 90 degrees. Is 60 less than or greater than 90?
Sean turns to face the opposite direction, making a half turn. How many degrees is a half turn?
Answer: B. 180 degrees
A full turn = 360 degrees A half turn = half of 360 degrees 360 / 2 = 180 degrees A half turn (straight angle) is 180 degrees.
Stuck? Start here: A full turn is 360 degrees. What is half of 360?
This is the exact interactive worked example your child sees in SEAGReady. Step through it and watch the method build up.
Ciara is looking at different corners in her classroom to find right angles.
Is the corner of her maths textbook a right angle?
90°
Step 1 of 4
Ciara is looking at different corners in her classroom to find right angles.
Is the corner of her maths textbook a right angle?
Yes, the corner of the textbook is a right angle (90 degrees).
The key insight: Right angles appear everywhere - look for the square corner 'L' shape!
Watch out: Thinking right angles only appear in squares and rectangles. Right angles appear in many places - book corners, door frames, even some triangles.
These are the misconceptions we see most often in classify angles, including the ones our practice questions are specifically designed to catch.
Struggling with classify angles? The real gap is often in one of these earlier topics.
SEAGReady finds the exact step where your child gets stuck, teaches it with worked examples like the one above, and brings it back for review so it sticks.