Răspuns :
ABCD- trapez dreptunghic. Unde A-90 greade, D-90 grade, B- 52 grade. C=?
A+B+C+D=360 grade => 90+52+90+C=360 garde
C=360-232 C=128 grade
A+B+C+D=360 grade => 90+52+90+C=360 garde
C=360-232 C=128 grade