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Narrow, square or wide angles
Age 9 · Maths
Open to everyone until Thursday, November 19
To keep it, print it while it is open.
A set square has a perfect square corner called a right angle. Put it in the corner of any angle to see if that angle is smaller, the same, or bigger.
In the picture
- Acute angle: narrower than the set square’s corner
- Right angle: fits the set square’s square corner exactly
- Obtuse angle: wider than the set square’s corner
Examples
- The corner of a book page is a right angle.
- A pair of scissors opened a little makes an acute angle.
Key takeaways
- The length of the sides does not change the size of an angle.
- Acute is smaller than a right angle, obtuse is bigger.
Quiz: Narrow, square or wide angles (Age 9)
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You put the square corner of a set square into an angle, and the angle is narrower than the corner. What kind of angle is it?
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Two angles are opened the same amount, but one has much longer sides than the other. Which is true?
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An angle is wider than the square corner of a set square. What is it called?
The answers, each with its explanation, are in the app. This quiz is free there while the lesson is in the free week.
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