Educational worksheet for identifying types of angles including acute, right, obtuse, and reflex angles.

Let's solve the Angles Worksheet step by step and explain each answer.

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Understanding the Angles:

We are given four angles labeled A, B, C, and D. Let’s analyze each one:

- Angle A: This is a small angle, less than 90°, formed between two lines. It looks like a sharp corner.
- Angle B: This forms a perfect "L" shape with a small square in the corner — this is a classic symbol for a right angle.
- Angle C: This angle is greater than 90° but less than 180° — it's an open angle, not a full turn.
- Angle D: This angle is shown with a curved line going around more than half a circle — it's larger than 180° but less than 360°.

Now let’s go through each question.

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1. Which angle is a right angle?

✔ Answer: B

🔹 Explanation: A right angle measures exactly 90 degrees. It is often marked with a small square at the vertex. Angle B has that square, so it is a right angle.

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2. Which angle is a reflex angle?

✔ Answer: D

🔹 Explanation: A reflex angle is an angle that is greater than 180° but less than 360°. In diagram D, the dashed arc shows the angle going around the vertex more than a straight line (180°), but not a full circle (360°). So, it's a reflex angle.

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3. Which angle is an acute angle?

✔ Answer: A

🔹 Explanation: An acute angle is less than 90°. Angle A is clearly smaller than a right angle, so it's acute.

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4. Which angle is an obtuse angle?

✔ Answer: C

🔹 Explanation: An obtuse angle is greater than 90° but less than 180°. Angle C is wider than a right angle but not as wide as a straight line — so it's obtuse.

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5. How many degrees are there in a right angle?

✔ Answer: 90°

🔹 Explanation: By definition, a right angle measures exactly 90 degrees.

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✔ Final Answers:

1. B
2. D
3. A
4. C
5. 90°

Let me know if you'd like a visual explanation or help printing this worksheet!