Task $1$ Arches under specific constraints

Find a possible form for an arch for the loading cases in situations a$)$ and b$).$ Consider the conditions below. Draw tension forces in red,

compression forces in blue and reaction forces in green.

In a$)$ the maximum inner force should be $22\mathrm{.}5$ Kips.

In b$)$ the thrust $($horizontal component of the reaction forces$)$ equals $27$ Kips.

a$)$