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180 - 90 derjat = 90 derjat
90 derjat = 2x + 3x
90 = 5x
X = 90 : 5
X = 18 derjat
Jadi besar sudut ABC = 3X = 3 x 18 derjat = 54 derjat
No 17.. Masi ragu
5x = 90
x = 18
Sudut ABC = 54 derajat
17. BCD = 1/2 X (144 + 56)
= 100 derajat
18. K = 2 X phi X r
= 2 X 22/7 X 14
= 88 cm
Busur = 88/5
= 17,6 cm
19. 50 = 30
120 = X
X = 120 X 30/50
= 72 cm²