# trigonometry

posted by jenna

given v=5i+3j and w=-4i+8j, find projwv

1. Damon

There are two kinds of projection of w on to v or of v on to w.
You did not say projection of which on the other or if you want scalar or vector projection.
see below:
Projections

One important use of dot products is in projections. The scalar projection of b onto a is the length of the segment AB shown in the figure below. The vector projection of b onto a is the vector with this length that begins at the point A points in the same direction (or opposite direction if the scalar projection is negative) as a.

Thus, mathematically, the scalar projection of b onto a is |b|cos(theta) (where theta is the angle between a and b) which from (*) is given by

This quantity is also called the component of b in the a direction (hence the notation comp). And, the vector projection is merely the unit vector a/|a| times the scalar projection of b onto a:

Thus, the scalar projection of b onto a is the magnitude of the vector projection of b onto a.

2. Damon
3. ky

it was proj with w as a subscript of proj and then v

4. Damon

I am sorry. I am not familiar with that notation. Follow the recipe in the link I gave you.

## Similar Questions

1. ### Trigonometry

find (acute) angle A, given: a. sin A = 0.4919 b. tan A = 2.7775 c. cos A = 0.5757
2. ### trigonometry

im really stuck on these, can anyone help me and also explain how to solve them: Find the exact values of s in the given intervals that have the given circular function values. 1. [pi/2, pi]; sin s=sqrt2/2 2. [pi/2, pi]; cos s=-sqrt3/2 …
3. ### Trigonometry

Given Triangle ABC: Right Triangles 1. If a = 6 and <B = 53º, find b, c, and <A 2. If c = 13 and b = 12, find a, <A, and <B 3. If <A = 20º and b = 10, find <B, a and c 4. If c = 30 and <A = 40º, find <B, …
4. ### Trigonometry

Given that circle A has a radius of 52 and a radii AB and AC form an angle of 132 degrees, find the exact length of BC
5. ### Trigonometry

Given triangle ABC with a = 16, b = 14, and Angle is = 54°, find the value of c. A. 3.1 and 20 B. 4.1 and 15 C. 15 D. 3.1
6. ### Trigonometry

Given triangle ABC with a = 16, b = 14, and Beta = 54°, find the value of c. A. 3.1 and 20 B. 4.1 and 15 C. 15 D. 3.1
7. ### Trigonometry

Given triangle ABC with gamma = 61.0°, Beta = 29.0°, and b = 20.5, find the value of a. A. 9.94 B. 11.4 C. 42.3 D. 37.0
8. ### Trigonometry

find the value for the indicated trig function for ø, if ø is an angle in standard position with the terminal side defined by the given point. (18,24); find cos ø
9. ### Trigonometry

1.Find the missing values given that Ø in degrees=270. 2.Find the missing values given that Ø in degrees=270. I can find the radians but not sin,cos,sec,tan,csc,cot i really need help
10. ### Trigonometry

1.Find the missing values given that Ø in degrees=30. Can someone show me how to find sin

More Similar Questions