The proof that quadrilateral WXYZ, having vertices W(-5, 6), X(-1, 10), Y(1, 4), and Z(-2, -3) is a trapezoid is given below.
Mathematical proof is a set of logical statements that are sequentially indicated to guaranty that a stated position is indeed accurate.
It is to be noted that with parallelograms, the diagonals intersect at the midpoints. (See the attached image).
The Diagonals are WY and XZ; Where
WY : (-4, -3) to (6, -2); and
Midpoint is [ (0 + 2)/2 , (-1 + -4)/2 ]
= (1, -5/2)
The diagonals are bisectors of each other.
It is to be noted that the diagonals are not congruent. For if they were congruent, then the above would not be a trapezoid.
The Length of WY = √((-4 - 6)² + (-3 - (-2))²)
WY = √(100 + 1)
WY = √101
The Length of XZ = √((0 - 2)² + ( -1 - -4)²)
XZ = √(4+9)
XZ = √13
From the above, it is clear that both diagonals are unequal. Hence, given the first and second proof, we can state that quadrilateral WXYZ is a Trapezoid.
QED
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