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    Question

    Angles of a triangle are in the ratio 3 : 5 : 10. Find

    the sum of the smallest and middle angle of the triangle.
    A 90° Correct Answer Incorrect Answer
    B 75° Correct Answer Incorrect Answer
    C 80° Correct Answer Incorrect Answer
    D 120° Correct Answer Incorrect Answer

    Solution

    Let the measure of the angles of the given triangle be '3x°', '5x°', and '10x°', respectively. Sum of angles of a triangle = 3x + 5x + 10x = 180° So, x = (180°/18) = 10° Therefore, the sum of smallest and middle angles of the triangle = 3x + 5x = 8x = 8 × 10° = 80° Hence,option c 

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