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Find a · b. |a| = 4, |b| = 7, the angle between a and b is 2π/3

Find a · b. |a| = 4, |b| = 7, the angle between a and b is 2π/3
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Find a ·
b. |a| = 4, |b| = 7, the angle between a and b is 2π/3

asked
User Dnnagy
by
8.2k points

1 Answer

5 votes

Answer:

-14

Explanation:

a·b = |a|×|b|×cos(angle between them)

= 4×7×(-1/2)

= -14

answered
User TheodorosPloumis
by
8.1k points
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