Express the position vector r in Cartesian vector form; then determine its magnitude and coordinate direction angles. Given: a = 8 ft b = 2

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Express the position vector r in Cartesian vector form; then determine its magnitude and coordinate direction angles.

Given:
a = 8 ft
b = 2 ft
c = 5 ft
θ = 30 deg
φ = 20 deg

a |B