No, it is not true.
Work Step by Step
When a plate is submerged vertically, the pressure is not constant along the plate, so the fluid force is not equal to the pressure times the area.
You can help us out by revising, improving and updating this answer.Update this answer
After you claim an answer you’ll have 24 hours to send in a draft. An editor will review the submission and either publish your submission or provide feedback.