Answer:
The measure of the indicated exterior angle is 105°.
Explanation:
2 angles of the triangle made up of the house, ladder and the ground are given: 15° and 90°. The angle in question is the triangle's exterior angle. Any exterior angle of any triangle has a property, where the sum of two interior angles is equal to the exterior angle opposite from the two interior angles. This means that the exterior angle is equal to:
90° + 15° = 105°