Question

an observer measures the angle from the ground to the top of a building from two different locations. the measurements are shown on the diagram. what is angle a? degrees

Explanation:

Step1: Use the property of a straight - line angle

The sum of angles on a straight line is \(180^{\circ}\). Let the angle adjacent to \(35^{\circ}\) and angle \(A\) and \(42^{\circ}\) form a straight line. So, \(35^{\circ}+A + 42^{\circ}=180^{\circ}\).

Step2: Solve for \(A\)

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Answer:

\(103\)