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Interior angles 1
Drag the names of the angles to their correct spots on the tangranimals. Choose between obtuse, acute and right angles. When you are finished, use the ‘Mark’ button to see if you are right.
Discussion points
- What is an obtuse angle?
- What is an acute angle?
- What is a right angle?
- Can you spot any of these angles in your surroundings?
Teaching tips:
Get children to stand up and all face the front of the classroom. Now get them to hold out their right arm in a horizontal line to the side and ask children to turn their bodies to face their arm; explain that they have moved a quarter turn clockwise, this is the same as a right angle. Repeat again to show an acute angle, this time show it as being a turn smaller than a quarter turn. Finally, repeat for an obtuse angle, making sure to move more than a right angle but less than half a turn. It would be useful to draw these labelled angles as you go through each one.
Children do not encounter degrees of turn until ages 9-11. If using this activity in aged 9-11 you could label the angles as ‘less than 90°’, ‘90°’ and ‘more than 90° but less than 180°.’
Follow with ‘Interior angles 2’ or ‘Exterior angles’ for a more in-depth look at angles including reflex angles encountered in age 9-11.
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