Jumplah sudutA dan sudutB adalah 90°.jika besar sudutA=(5x+5)°dan sudutB=(2x+15)°.maka besar sudutA adalah...
A.35°
B.50°
C.55°
D.70°
A.35°
B.50°
C.55°
D.70°
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90 = ( 5x + 5 ) + ( 2x + 15 )
90 = 7x + 20
90 - 20 = 7x
70 = 7x
70 ÷ 7 = x
10 = x
Sudut A = 5x + 5
Sudut A = 5 (10) + 5
Sudut A = 50 + 5
Sudut A = 55
Maka besar sudut A adalah 55°. [ C ]
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