Parts of an Angle
An angle has 1 vertex and 2 arms; the wider the opening, the bigger the angle
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An angle has 1 vertex and 2 arms; the wider the opening, the bigger the angle
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An angle is made of one vertex and two arms, and its size depends on how far the arms open — not on how long they are drawn. Tap “Wider / Narrower” to swing one arm while the vertex stays put: the more the arms spread, the bigger the angle. After a few rounds, children stop judging angles by arm length.
Tap “Wider / Narrower” to swing one arm of the angle: the vertex stays put while the arm opens and closes. The size of an angle is about the opening, not the length of the arms.