Besar sudut a (4×-25°)

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Besar sudut b (×-5°)
Besar sudut c (3×+10°)
Besar sudut BAC adalah
A.65
B.75
C.80
D.85

Besar sudut a (4×-25°)

Jawab

4x – 25 + x – 5 + 3x + 10 = 180°

4x + x + 3x – 25 – 5 + 10 = 180°

8x – 20 = 180

8x = 180 + 20

8x = 200°

x = 200/8

x = 25°

BAC = 4x – 25

= 4 (25) – 25

= 100 – 25

= 75