NOTE: Value of $B=4\mathrm{.}9$ meter

Question $1$:

The three$-$hinged arch in Figure $1$ is pin supported at A and E $.$ The arch is subjected to two concentrated loads at B and $D,P_1=3**B(kN)$ and $P_2=2**B(kN).$ The dimensions of the arch $are{L}_1={0\mathrm{.}25}^{**}B(m),L_2={0\mathrm{.}75}^{**}B(m),L_3=B(m)$ and $L_4={0\mathrm{.}5}^{**}B(m).$

$($a$)$ Determine the support reactions at the pin supports A and $E.$

$($b$)$ Calculate the internal forces at the hinge $C.$