If I delete a photo on my iphone is it deleted in the cloud?

If you are using iCloud Photos, yes it will be deleted. iCloud Photos is a syncing service, not off device storage. The text below is copied from this support article.

Set up and use iCloud Photos - Apple Support

What happens when you edit or delete photos

When you edit or delete photos or videos, the changes are reflected across all of your devices.

iCloud Photos is a syncing service. Any photo you delete from a device where iCloud Photos is turned on will also be deleted from iCloud and from any other device connected to iCloud Photos. You can potentially reduce the storage space required on a device by turning on Optimize Storage. See the following Apple article for more information: Set up and use iCloud Photos - Apple Support

Apple does not currently offer cloud-only storage for photos. If that is what you want or need, you may want to explore 3rd party options such as Google Photos or Dropbox.

Another way that photos may be on iCloud (if you don’t have iCloud Photos turned on) is via a backup of an iOS device. The only thing you can do with a backup is use it to restore a device or set up a new device. The contents of backups are not viewable at iCloud.com and if you delete a photo from a device it will not be included in future backups and will be lost.