All sides are defined, so we use the <em>Law</em><em> </em><em>of</em><em> </em><em>Cosines</em>. Plus, the angle opposite from side <em>a</em><em> </em>is the largest.
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Multiply the NZ dollar amount by the conversion factor:
900 NZ dollars 1 US dollar
--------------------- * -------------------------- = $635.28, or approx. $635.
1 1.4167 NZ dollars
Recall that the conversion of 155% to decimal is to divide by 100. Thus, 155%=1.55.
Now, multiply this by 80:

So our answer is 124.
Referring to the image attached:
this is an isosceles triangle