3. A+P = 90° → P = 90° - 60°= 30°; B+Q = 90° → Q = 90° - 42° = 38°; C+R = 90° → R = 90° - 37°43' = 89°60' - 37°43' = 52°17'.
4. M+U = 180° → U = 180° - 120° = 60°; N+V = 180° → V = 180° - 150° = 30°; P+W = 180° → W = 180° - 165°34' = 189°60' - 165°34' = 24°26'.
5. ABC+CBD = 90° si ABC=CBD → ABC=CBD = 45°.
6. BAC+CAD = 180° si BAC = CAD → BAC=CAD=90°.
7. A+M = 180° si B+M = 180° → A=B = 180° - 128° = 52°
