• question_answer The figure given has a perimeter of 51 cm. $\text{AB}=\text{CD}=\text{AD}=\text{12 cm}.$ Find the length of the curved line. A)  12 cm             B)    15 cm C)    27 cm             D)    39 cm

The perimeter of the given figure = AB + CD + AD + CB $=(\text{12}+\text{12}+\text{12}+\text{CB) cm}$ $=\text{ (36}+\text{CB) cm}=\text{51 cm}$ (Given) $\therefore$  $\text{CB}=(\text{51}-\text{36})\text{ cm}=\text{15 cm}$