Find the angle between the vectors =+ and =−+. (Give an exact answer. Use symbolic notation and fractions where needed.)

The angle between them is 60 degrees

Step-by-step explanation:

Given

Required

The angle between them

The cosine of the angle between them is:

First, calculate a.b

Multiply the coefficients of like terms

Next, calculate |a| and |b|

Recall that:

This gives:

Take arccos of both sides

step-by-step explanation: h: (- 3, 6)

m: (1, - 2)

o: (7, 6)

r: (- 9, - 2)

midpoint of hm: (- 1, 2)

midpoint of or: (- 1, 2)

therefore, b is the midpoint of both diagonals bisect each other !

to prove the diagonals are perpendicular, show that the product of the slopes = - 1

this is not the answer this is just a question. is this middle school math?

step-by-step explanation: