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The diagonals of a parallelogram intersect at a 42◦ angle and have lengths of 12 and 7 cm. Find the lengths of the sides of the parallelogram. (Hint: The diagonals bisect each other.)

  • Trig -

    if the sides have length a and b,

    a^2 = 6^2 + 3.5^2 - 2(6)(3.5)cos42
    b^2 = 6^2 + 3.5^2 + 2(6)(3.5)cos42

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