x^2 - y^2 - 2y - 1
x^2 - (y+1)^2
Area of sector



so the area = 37.71 square metre
Here is you're answer:
In order to cross multiply you have to multiply the numerator and denominator of the first fraction by the bottom number of the second fraction and see if the equation is still true:
Therefore you're answer is "3 × 1 = 5 × 10."
Hope this helps!
Answer:
1 possibility is there for the the position of the fourth vertex.