Draw two intersecting lines to include an angle of 30∘. Use ruler and compass to locate points which are equidistant from these lines and also 2 cm away from their point of intersection. How many such points exist?
4 points
Draw two intersection lines AB and CD intersection at O such that ∠AOC = 30∘ . Clearly, points equidistant from these lines lie on the bisectors of ∠AOC, ∠AOD, ∠DOB and ∠BOC. Draw the bisectors of these angles.
Taking O as centre and radius of 2cm, draw a circle. Clearly, this circle cuts OP, OR, OQ and OS at four points L,M,N and U respectively.
Hence, there are four points which are equidistant from AB and CD and 2 cm away from O.