question_answer

Two corners of a napkin are folded as shown. Find the area of the napkin when it is unfolded.

A)  \[60\text{ }c{{m}^{2}}\]

B)  \[225\text{ }c{{m}^{2}}\]

C)  \[195\text{ }c{{m}^{2}}\]

D)  \[450\text{ }c{{m}^{2}}\]

Correct Answer: C

Solution :

: Unfolded form of given napkin is shown as below. Area of napkin \[=\text{ }AD\times DC\] \[=[(9+4)\times (9+2+4)]c{{m}^{2}}\] \[=(13\times 15)\,c{{m}^{2}}=195\,c{{m}^{2}}\]