Fie a,b cele doua unghiuri complementare. Fiind unghiuri complementare vom avea suma lor : a+b=90 de grade. In enunt ni se da diferenta lor :
a - b = 8 grade 20 minute. Vom face adunarea celor doua ecuatii si vom avea:
a+b+a-b=90 + 8 grade 20 minute => 2a = 98 grade 20 minute => a= 49 grade 10 minute . De aici b va fi 49 grade 10 minute - 8 grade 20 minute = 40 grade 50 minute. Deci S: a=49 grade 10 minute iar b=40 grade 50 minute.
