Maths dictionary
What is a right angle?
A right angle is an angle of exactly 90 degrees, like the corner of a square or a book.
Definition
A right angle is an angle of exactly 90 degrees, like the corner of a square or a book.
Example
The corners of a rectangle are all right angles.
Tip
A right angle is shown with a small square in the corner.
Practise it
- Learn it visually: Angles in a Triangle (interactive lesson)
- Play: Angle Estimator
- Online maths practice
Quick check: try these
Work each one out on paper, then tap the question to see the answer.
A right triangle has legs of 16 and 30. The hypotenuse is
Answer: 34
A right triangle has legs of 20 and 21. The hypotenuse is
Answer: 29
A right triangle has legs of 9 and 40. The hypotenuse is
Answer: 41
A right triangle has legs of 5 and 12. The hypotenuse is
Answer: 13
Learn it in depth
Right angle is part of Pythagoras Theorem for Class 7: notes, formulas, solved examples with every step, common mistakes and ten practice questions with answers. Want a teacher to go through it with you? See Class 7 maths tuition.
Related words
FAQ
Right angle: questions
What is a right angle?
A right angle is an angle of exactly 90 degrees, like the corner of a square or a book. The corners of a rectangle are all right angles.
What is a common mistake with right angle?
A right angle is shown with a small square in the corner.
Where do students learn right angle?
Pythagoras Theorem is usually taught in Class 7, and the ideas come back in later classes. Chapter names and order differ by board and textbook, so follow your own textbook. We have a full page with notes, solved examples and practice questions.
Play it, don't just read it
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Profit and loss (Grade 7): Finding profit or loss as a percentage of the cost price, and the selling price after a gain or loss. Open the practice page or print a worksheet.
Or play a game
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