📐 Turn the Arm
What makes an angle bigger?
Two arms meet at a corner. Draw them longer and the angle looks huge. But is it really bigger? Let’s turn an arm, stretch it, and lay one angle right on top of another.
Start turning ↓One arm stays. One arm turns.
Press Next step. Watch the shaded wedge.
📐 The angleStep 1 of 7
“Angle B is bigger. Look how long its arms are!”
An angle measures the turn between the arms,
not how long the arms are.
not how long the arms are.
Your turn: 5 angle challenges
Long arms, short arms, tilted arms. Can you see the turn every time?
🎯 Challenge0 of 5 done
⭐ You saw through the trap
An angle is a turn.
Acuteless than
a square corner
a square corner
Righta quarter turn:
a square corner
a square corner
Obtusemore than a square corner, less than a half turn
Straighta half turn:
a straight line
a straight line
To compare two angles, put their corners together and lay one arm on top of the other. Whichever turned farther is the bigger angle. Long arms, short arms: it doesn’t matter. The minute hand and the hour hand make a right angle at 3:00, even though one is much longer.