WALT: Identify how many degrees are in various angles and lines.
The various angles
A right angle is an angle that measures 90˚. It is also known as a 'quarter turn' because it is a quarter of a full turn, which measures 360˚. A right angle is represented by a small square inside the angle. | |
An acute angle is one that measures LESS than 90˚. | |
An obtuse angle is one that measures between 90˚ and 180˚. | |
A reflex angle is an angle that measures between 180˚ and 360˚. | |
Label what type of angles these are: Obtuse, Acute, Right angle or Reflex
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All angles on a line add up to 180°. Work out what these missing angles are (they are not drawn to scale so don’t measure!)
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Angles in a triangle also total 180°. What are the missing angles in these triangles? Can you work out the angles in a square?
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What is the missing angle in the first picture? How did you get that?
What is the missing angle in the second picture? How did you get that?
What is the missing angle in the first picture? How did you get that?
What is the missing angle in the second picture? How did you get that?