Angle Types Notes and Worksheets - Lindsay Bowden - Free Printable

Let’s go step by step to fill in the “Definition” column for each angle type. We’ll use simple, clear definitions that match the pictures shown.

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Acute Angle
Looking at the picture: it’s a small angle — smaller than a right angle (like the corner of a square).
→ Definition: An acute angle is an angle that measures less than 90 degrees.

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Right Angle
The picture shows two lines meeting at a perfect L-shape, with a little square symbol. That square means it’s exactly 90 degrees.
→ Definition: A right angle is an angle that measures exactly 90 degrees.

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Obtuse Angle
The picture shows an angle that’s wider than a right angle but not all the way flat. It looks like it’s between 90 and 180 degrees.
→ Definition: An obtuse angle is an angle that measures more than 90 degrees but less than 180 degrees.

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Straight Angle
The picture shows a straight line with arrows on both ends — that’s 180 degrees, like a straight road.
→ Definition: A straight angle is an angle that measures exactly 180 degrees.

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Reflex Angle
The picture shows an angle that goes around more than half a circle — bigger than 180 degrees but not a full circle.
→ Definition: A reflex angle is an angle that measures more than 180 degrees but less than 360 degrees.

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Full Rotation
The picture shows a complete circle with one ray going around back to where it started — that’s a full turn.
→ Definition: A full rotation is an angle that measures exactly 360 degrees.

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Final Answer:

| WORD | DEFINITION |
|------------------|-------------------------------------------------|
| Acute Angle | Less than 90 degrees |
| Right Angle | Exactly 90 degrees |
| Obtuse Angle | More than 90 degrees but less than 180 degrees |
| Straight Angle | Exactly 180 degrees |
| Reflex Angle | More than 180 degrees but less than 360 degrees |
| Full Rotation | Exactly 360 degrees |