Answer variants:
18
170.64
171.64
19
An isosceles triangle has perimeter 60 \(cm\) and each of the equal sides is 21 \(cm\). Determine the third side and the area of the triangle. (Use \(\sqrt{10} = 3.16\))
Third side of the triangle \(=\) \(cm\)
Area of the triangle \(=\) \(cm^2\)
[Note: Round off your answer to two decimal places]