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Hello Alexandre, The app does not support iOS 7.1.2, it requires minimum iOS 8.1 and iPhone 4s. Best regards LikeLike March 10, 2016 at 7:39 am
Hello Keith, Did you insert the parameter in both fields (perimeter field and area field) and it did not work? Best regards LikeLike March 10, 2016 at 7:42 am
GremlinsSoft 
Hello Alexandre,
The app does not support iOS 7.1.2, it requires minimum iOS 8.1 and iPhone 4s.
Best regards
LikeLike
Hello Keith,
Did you insert the parameter in both fields (perimeter field and area field) and it did not work?
Best regards
LikeLike