Which of the four angles marked on the bicycle is obtuse?

A drawing of a bicycle has 4 angles marked. Angles 1, 2, and 4 are smaller than angle 3, which is between the seat and the back support bar. Angles 1 and 2 are inside the frame and angle 4 is between the handlebars and the front support bar.
CLEAR CHECK

Angle 1



Angle 2



Angle 3



Angle 4

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