to figure out the area you have to use the formula 1/2 base times height. 
 
        
             
        
        
        
A parallelogram is a quadrilateral in which both pairs of opposite sides are parallel . ... Opposite sides are congruent; Adjacent angles are supplementary; The diagonals bisect each other.
 
        
             
        
        
        
The rule for clockwise rotation of 90 degrees about the origin is (-y, x).
So (-1,9) would now be (-9,1).
Hope this Helps!!
 
        
             
        
        
        
The least common denominator is 15. The equivalent fractions would be 10/15 and 12/15.