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March 27, 2017

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ok I'm trying to solve for an angle knowing adjacent and opposite of a triangle

so I do tangent

by definition

tan theta = a^-1 o

how do I algebraically solve for theta

  • trig - ,

    Do you mean adjacent SIDE? and opposite ANGLE?
    If so, use the law of sines to get the angle B that is opposite the adjacent side (b).
    Let A be the angle for which you know the adjacent side length, a. Then
    a/sin A = b/sin B
    solve for sin B and angle B
    Then use C = 180 - A - B degrees
    There will be two possible values of B if obtuse angles are allowed. If so, you have been given the ambiguous side-side-angle (SSA) set of known quantities.

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