What is the perimeter of \[\Delta \,ABC\]?
A) 19 cm
B) 21 cm
C) 24 cm
D) 25 cm
Correct Answer: B
Solution :
(b): Perimeter \[=AB+BC+CA:BC\] is already known \[=6\text{ }cm\] From \[\Delta BCF,\,\,CF=\sqrt{{{6}^{2}}+{{3}^{2}}}=3\sqrt{3}=BE\] In \[\Delta \,BEA,\,\,AB=\sqrt{{{45}^{2}}{{\left( 3\sqrt{3} \right)}^{2}}}\] Similarly, find CA and add \[AB+BC+CA\]
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