Maths-
General
Easy

Question


In the figure above, Error converting from MathML to accessible text. and Error converting from MathML to accessible text. are parallel, Error converting from MathML to accessible text. and Error converting from MathML to accessible text. are parallel, CD = CE, and the measure of Error converting from MathML to accessible text. is 1150. What is the measure of Error converting from MathML to accessible text. ?

  1. 85
  2. 115
  3. 125
  4. 140

The correct answer is: 115


    HINT: From the information given in the question, find the angles.
    Complete step by step solution:
    Given BC and AD are parallel and AB and EC are parallel.
    From this, we can conclude that ABCE is a parallelogram.
    straight angle ABC space equals space 115 to the power of ring operator (given)
    So, straight angle AEC space equals space straight angle ABC space equals space 115 to the power of ring operator (Since opposite angles of a parallelogram are equal.)
    And straight angle BCE space equals space 65 to the power of ring operator (Since consecutive angles of a parallelogram are supplementary angles to each other.)
    We get that,
    straight angle DEC space equals space 65 to the power of ring operator(Since BC ∥ AD and CE acts as a transversal, so straight angle BCE and straight angle DEC are alternate interior angles.)
    Since CD = CE, ΔECD is an isosceles triangle.
    So we get, straight angle DEC space equals space straight angle EDC space equals space 65 to the power of ring operator (Since two angles opposite to the equal sides of an isosceles triangle are equal.)
    Hence, straight angle ECD space equals space 180 space minus open parentheses 65 space plus space 65 right parenthesis space equals space 50 to the power of ring operator close.(Since the sum of all angles of a triangle is 180°.)
    To find, straight angle BCD space equals space straight angle ECD space plus space straight angle ECB space equals space 50 to the power of ring operator plus space 65 to the power of ring operator space equals space 115 to the power of ring operator
    So, straight angle BCD space equals space 115 to the power of ring operator
    Hence option B is the answer.

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