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Find $ a \cdot b $.

$ \mid a \mid = 7 $ , $ \mid b \mid = 4 $ , the angle between $ a $ and $ b $ is $ 30^\circ $

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$a \cdot b=14 \sqrt{3}$

Calculus 3

Chapter 12

Vectors and the Geometry of Space

Section 3

The Dot Product

Vectors

Missouri State University

Campbell University

Idaho State University

Boston College

Lectures

02:56

In mathematics, a vector (from the Latin word "vehere" meaning "to carry") is a geometric entity that has magnitude (or length) and direction. Vectors can be added to other vectors according to vector algebra. Vectors play an important role in physics, engineering, and mathematics.

11:08

In mathematics, a vector (from the Latin word "vehere" which means "to carry") is a geometric object that has a magnitude (or length) and direction. A vector can be thought of as an arrow in Euclidean space, drawn from the origin of the space to a point, and denoted by a letter. The magnitude of the vector is the distance from the origin to the point, and the direction is the angle between the direction of the vector and the axis, measured counterclockwise.

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to remember that a dot B is ninety two. Today was magnitude of B times co sign of the angle. So a dot B we just plug everything in that four times. Seven times co sign of thirty degrees twenty eight times rat three over to. So we got fourteen. Rat three is adoptee.

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