tentukan besar sudut. kk tlg bantu y kk yg b dan c pakai cara.besok dikumpul

b. b + 2b + 90° = 180°
    3b = 180° - 90°
    b = 90°/3 = 30°
    b = 30°
    sudut b = 30°
    sudut 2b = 2 x 30° = 60°
    sudut siku-siku = 90°
c. 3c + 2c + c = 180°
    6c = 180°
    c = 180°/6 = 30°
    c = 30°
    sudut 2c = 2 x 30° = 60°
    sudut 3c = 3 x 30° = 90°
    sudut c = 30°