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 \(f\) \(=\) $i\mathrm{°}$