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Construct an angle of 60^@ at the init...

Construct an angle of `60^@` at the initial point of a given ray.

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Draw a ray `AB` with initial point `A`.

Taking `A` as center and some radius draw an arc, which intersecrs `AB` at point `D`.

Taking `D` as center and with same radius as before, raw an arc intersecting the previously drawn arc at point `E`

Draw the ray `AC` passing through `E`. Thus,
`/_CAB=60`.
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