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sudutABD = 58 derajat
sudutOAB = 90-58 = 32 derajat
sudut OAB=sudut OCB = 32 derajat
sudut BCD = 2 . sudut OCB = 64 derajat
perhatikan segitiga BCD
< BCD = 180° - (2 x 58°)
= 180° - 116°
= 64° (c)
11) KL = MN
5x - 6 = 2x + 12
5x - 2x = 12 + 6
3x = 18
x = 6
MN = 2x + 12
= 2.6 + 12
= 24 cm (d)
semoga membantu ya :)