The measure of angle x is 110°.
Since the sum of the angles in a triangle has to equal 180, you know that angle BCA is 180 - (70+40), or 70°.
Angle BCA is supplementary to x, which means together they add up to 180.
Therefore, x = 180 - 70 = 110°.
What are Supplementary Angles?
Supplementary angles are those angles that sum up to 180 degrees. For example, angle 130° and angle 50° are supplementary angles because the sum of 130° and 50° is equal to 180°. Similarly, complementary angles add up to 90 degrees.
Learn more about supplementary angles here: https://brainly.com/question/404323
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