Answer
If two lines meet to form a right angle, then these lines are perpendicular.
![](https://gradesaver.s3.amazonaws.com/uploads/solution/23202ef7-9a22-4f6a-90cc-b98b784799a9/result_image/1551540470.jpg?X-Amz-Algorithm=AWS4-HMAC-SHA256&X-Amz-Credential=AKIAJVAXHCSURVZEX5QQ%2F20240727%2Fus-east-1%2Fs3%2Faws4_request&X-Amz-Date=20240727T020410Z&X-Amz-Expires=900&X-Amz-SignedHeaders=host&X-Amz-Signature=6446d3119423b79f9e67e2d698141a0367f2250ae0e7b97d3c390fa6a35f3997)
Work Step by Step
Given: The blue line and the black line meet to form a right angle.
Proof: We can see that the blue line and the black line are perpendicular.
Therefore, if two lines meet to form a right angle, then these lines are perpendicular.
![](https://gradesaver.s3.amazonaws.com/uploads/solution/23202ef7-9a22-4f6a-90cc-b98b784799a9/steps_image/small_1551540470.jpg?X-Amz-Algorithm=AWS4-HMAC-SHA256&X-Amz-Credential=AKIAJVAXHCSURVZEX5QQ%2F20240727%2Fus-east-1%2Fs3%2Faws4_request&X-Amz-Date=20240727T020410Z&X-Amz-Expires=900&X-Amz-SignedHeaders=host&X-Amz-Signature=43b33cf25c214b7813a408b78314e6593f84bd92888bd663adb71bc3e2e34068)