Right Angle Identification: Which Figure Shows a 90-Degree Angle?

Right Angle Recognition with Visual Identification

Which figure depicts a right angle?

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Step-by-step video solution

Watch the teacher solve the problem with clear explanations
00:02 Let's find the drawings that have a right angle!
00:06 Remember, a right angle is 90 degrees. It makes the lines perpendicular.
00:11 Great job! That's how we solve this problem.

Step-by-step written solution

Follow each step carefully to understand the complete solution
1

Understand the problem

Which figure depicts a right angle?

2

Step-by-step solution

A right angle is equal to 90 degrees.

In diagrams (a) and (c), we can observe that the angle symbol is a symbol representing an angle that equals 90 degrees.

3

Final Answer

Key Points to Remember

Essential concepts to master this topic
  • Definition: A right angle measures exactly 90 degrees
  • Symbol Recognition: Look for the small square marking at angle vertex
  • Verification: Check perpendicular lines form perfect 90-degree corners ✓

Common Mistakes

Avoid these frequent errors
  • Confusing acute or obtuse angles for right angles
    Don't assume any corner is 90 degrees without the square symbol = wrong identification! Angles can look like right angles but measure differently. Always look for the small square symbol at the vertex that specifically marks 90-degree angles.

Practice Quiz

Test your knowledge with interactive questions

Look at the angles shown in the figure below.

What is their relationship?

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FAQ

Everything you need to know about this question

What does the small square symbol mean in angle diagrams?

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The small square symbol at the vertex specifically indicates a right angle (90 degrees). This is the universal mathematical symbol that tells you the angle is exactly 90°.

Can I tell if an angle is 90 degrees just by looking at it?

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No, you cannot! Angles that look like right angles might actually be 89° or 91°. Always rely on the square symbol or given measurements rather than visual estimation.

Why do some angles look like right angles but aren't marked?

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In math diagrams, only angles that are exactly 90 degrees get the square marking. If there's no square symbol, the angle might be close to 90° but not precisely a right angle.

What's the difference between perpendicular lines and right angles?

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Perpendicular lines meet at right angles! When two lines are perpendicular, they form four right angles at their intersection point.

Are all corners in rectangles right angles?

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Yes! By definition, rectangles have four right angles. Squares are special rectangles where all sides are equal and all angles are 90°.

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