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10 cards from this deck
D=A+(C−B)=(2i+j)+(−2i−2j)=0−iD = A + (C - B) = (2i + j) + (-2i - 2j) = 0 - iD=A+(C−B)=(2i+j)+(−2i−2j)=0−i.
D=(0,−1)D = (0, -1)D=(0,−1) or D=0i−1jD = 0i - 1jD=0i−1j.
They are multiples of each other in direction.
A 4-sided shape with parallel sides and right angles.
A 4-sided shape with two pairs of parallel sides.
Two vectors are parallel if one is a scalar multiple of the other.
Show AB=CDAB=CDAB=CD and BC=ADBC=ADBC=AD as equal vectors.
Grad(BC)=1(BC) = 1(BC)=1 and Grad(CD)=−1/4(CD) = -1/4(CD)=−1/4; not perpendicular.
A shape with four sides of equal length.
Gradients show lines are not perpendicular.
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