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diket sdt keliling/ sdt BCA = 25
sdt pst/ sdt AOB = 25 x 2
= 50
b. sdt OAB = 180-50
= 130 :2
= 65
c. sdt ABC = 65
d. sdt BAC = 180- 25
= 155 : 2
= 77,5
4. a. nilai x
sdt RQP =
=
2x + x + 90 = 180
3x + 90 =180
3x = 90
x = 90 :3 = 30
b. besar sdt PRQ (2x)
= 2 x 30 = 60