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asa!!

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i have a camera. I do not know the focal length nor the frame size.i want to calculate the FOV.listen to what i thought.i did an experiment.i was taking photos of a wall withbricks soas to be able to calculate the size of the wall i was phtographing each time.at each phot i was changingthe distance between the camera and the wall. i imagined a equilateral triangle.the base is the size of the wall.the height is the distance between the camera and the wall. from there i calculated the tan of the half angle of thetriangle.then i found the half angle , multiplied it by two and i found the whole angle of the triangle. i think this is the FOV.am i right or i have done sillu things?thank you very much