How is an RA depicted on the MFD and on the PFD?

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An RA is a TCAS instruction to avoid a potential collision, and the cockpit displays are designed to show this quickly and clearly. In this setup, the RA is shown on the MFD as a green square, signaling that a resolution advisory is active and you should follow the recommended maneuver. On the PFD, the VSI displays a blue arc, representing the vertical maneuver guidance the RA is asking you to execute and the rate of climb or descent needed. The combination—green square on the map display and a blue arc on the VSI—lets the pilot recognize both that an advisory exists and the corresponding vertical action, without having to hunt through text or other indicators. Other color/shape schemes (like red or amber symbols, or different symbols on the VSI) aren’t used here, so the green square and blue arc are the correct depiction in this context.