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2a° + (a+26)° + 19° = 180°
3a° + 45° = 180°
3a° = 180° - 45°
3a° = 135°
a° = 45°
Maka besar sudut P = 2a° = 2 × 45° = 90°
Karena salah satu sudutnya = 90° = siku-siku, maka segitiga PQR = segitiga A. siku-siku
3a+45=180
3a =180-45
3a =135/3
a =45
sudut P : 45x2=90°
sudut Q : 45+26=71°
sudut R : 19°
saya gak tau itu segitiga apa, tapi sudut nya udah ketauan tuh. sekian