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To find the easiest way to do the above problem,you need to use the rule of pythagoras. This rule is: a squared+b squared=c squared. So if you know the two lengths of a triangle, you can work out all 3. so if one of the lengths is 6 and the other is 3, you would have to do this equation: 6 squared+3 squared=45. then you would need to find the square root of 45, which equals:6.7. so then you have the 3 sides of a triangle. so to work the area of the square, you need to count gaps in between the dotted pape and make a right angled triangle. after counting that, you then go into pythagoras. once you have found the missing side that you needed, then just square it , and you have the area of your square. alternatively, you dont have to square root the answer from a squared + b squared you can just use the answer from that equation, and then you have your area.