Di ketahuikoordinat titik P (2,-1), Q (2, 5), dan R (4,-2). Jika a = PQ dan b = QR, hasil 1/2 a+b =

P (2,-1)
Q (2,5)
R (4,-2)

a = PQ = 2 - 2 , 5 -(-1)
a (0, 6)

b = QR = 4-2, -2-5
b = 2, -7

a + b = (0,6) + (2, -7)
A + b = (2, -1)

1/2 (a+b) = 1/2 (2, -1)
= 2/2 , -1/2
= 1, -1/2