tolong dong kakak kakakku jawab ini pertanyaan plsss soalnya cuma 2. poinnya langsung nambah 100 lhoh
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PEMBAHASAN
No. 9
Sudut
sudut sehadap, sama besar
B2 = A2 = 59°
sudut berpelurus, jumlahnya 180°
B2 + B3 = 180°
59° + B3 = 180° - 59° = 121°
sudut saling bertolak belakang, sama besar
B4 = B2 = 59°
sudut sehadap
C3 = B3 = 121°
D4 = B4 = 59°
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No. 10
A + B + C = 180°
80° + x + 60° = 180°
x = 40°
x + y = 180°
y = 180° - x
y = 180° - 40°
y = 140°