Question

With the help of a ruler and a compass it is possible to construct an angle of 37.5°?

Answer 1

${37.5}^{\circ }=\frac{1}{2}\times {75}^{\circ }$
${75}^{\circ }$ can be constructed with the help of a ruler and a compass.
So ${37.5}^{\circ }$ is also possible to construct by using a ruler and a compass.