11. Five marks exercise problems III

 

Iron rods $a$, $b$, $c$, $d$, $e$, and $f$ are making a design in a bridge as shown in the figure. If $a||b$, $c||d$, $e||f$, find the marked angles between:

(i) $b$ and $c$ $=$ $i\mathrm{°}$

(ii) $d$ and $e$ $=$ $i\mathrm{°}$

(iii) $d$ and $f$ $=$ $i\mathrm{°}$

(iv) $c$ and $f$ $=$ $i\mathrm{°}$