Answer
The altitude is in red in the diagram.
Work Step by Step
In order to do this, first draw obtuse triangle ABC. Next, as the book suggests, extend line BC. Finally, draw a line segment starting at A to BC that is perpendicular to line BC. This is the altitude.
![](https://gradesaver.s3.amazonaws.com/uploads/solution/3253c197-48da-4ae1-aa86-6d7d95ac8e13/steps_image/small_1528213356.jpg?X-Amz-Algorithm=AWS4-HMAC-SHA256&X-Amz-Credential=AKIAJVAXHCSURVZEX5QQ%2F20240908%2Fus-east-1%2Fs3%2Faws4_request&X-Amz-Date=20240908T001728Z&X-Amz-Expires=900&X-Amz-SignedHeaders=host&X-Amz-Signature=84312b7bce27ee95ab1697458ec3a7bf5a5baa74936813c70d7f1255330223b1)