Each of the angles represented here is either acute or obtuse. Estimate the sizes of each of the angles then add your estimates together.
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Topics: Starter  Angles  Estimating  Geometry
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Previous Day  This starter is for 28 May  Next Day
77^{o}  37^{o}  
90^{o}  
47^{o}  87^{o} 
Adding the angles together gives 338^{o}
Note to teacher: There are a number of factors which might make your projected image of the angles be slightly stretched. If this is the case the answers above will be unreliable. There is a protractor in the diagram which can be dragged over the angles. The green buttons will rotate the protractor. Right click over the diagram to zoom in in order to read the protractor accurately.
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