Current location - Training Enrollment Network - Mathematics courses - Mathematical vector triangle problem in senior three.
Mathematical vector triangle problem in senior three.
If it is the product of quantity, it is a*b=|a|. |b|cos(a,b)=|a|。 |b|。 ( 1/5).

b*c=|b|。 |c|cos(b,c)=|b|。 |c|。 (- 1/3)

a*c=|a|。 |c|cos(a,c)

As can be seen from a+b+c=0, vectors A, B and C form an end-to-end triangle, which is a solution triangle in common English.

Let vectors A, B and C correspond to three sides A, B and C of a triangle respectively, and the corresponding angles are also Angle A, Angle B and Angle C..

Then cos angle C= 1/5 cos angle A=- 1/3, then cos angle b can be obtained from angle A+ angle B+ angle C= 180 degrees.

Find the Cos angle b, because the length of the B side of the triangle is = 1, so you can find the combination angle.

Face a and face c, so that a*c=|a|. |c|cos angle b solution.

Hello, classmate, if the problem has been solved, remember to adopt in the upper right corner ~ ~ ~ Your adoption is my affirmation ~ Thank you.