Midpoint FormulaThe midpoint M between points (x,y) and (a,b) is given by
In other words, to find the midpoint, simply average the corresponding coordinates of the two points.
In the figure, polygon PQRO is a square and T is the midpoint of side QR. What are the coordinates of T ?
- (1, 1)
- (1, 2)
- (1.5, 1.5)
- (2, 1)
- (2, 3)
Since point R is on the x-axis, its y-coordinate is 0.
Further, since PQRO is a square and the x-coordinate of Q is 2, the x-coordinate of R is also 2.
Since T is the midpoint of side QR, the midpoint formula yields
The answer is (D).