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Q Calculate the unknowns.
a) c b) B C)
64° /
6^
4
d) e) ( Remember to State
'A sum of A'.
35\
Xso" r
/ \ 1 1
D
6.3.2 Sum of angles at a point
Investigate!
The arms of these angles are drawn from the same point.
Measure the size of the angles in each diagram to find out what is the sum of angles
at a point.
B
a) How many angles can you see?. a) How many angles can you see?.
b) Use your protractor to measure b) Use your protractor to measure
the size of each angle. the size of each angle.
i) a6c = i) AOD =
ii) A6B = ii) d6c =
,
lii) b6c = iii) a6b = .
c) What is the sum of the angles?. iv) b6c =
c) What is the sum of the angles?
Conclusion
The sum of the angles at a point is
