Is gradle installed with Android Studio on Windows?
Solution 1:
Android Studio installs Gradle in a folder that looks like:
C:\Users\<username>\.gradle\wrapper\dists\gradle-7.0.2-bin\857tjihv64xamwrf0h14cai3r\gradle-7.0.2\bin
Please note that "7.0.2" is the gradle version, and this number may be different for you.
Find this path in you computer and add it to Windows "Path" environment variable. On Start Menu, type "environment variable", select "Path", click on "Edit" and add the gradle path to the list.
Restart "Command Prompt" (or PowerShell) before running cordova requirements again.