C. 30°
Penjelasan dengan langkah-langkah:
Nilai y
<POR + <QOR = 90° (berpenyiku)
(7y + 11)° + (3y + 9)° = 90°
10y + 20° = 90°
10y = 90 - 20
10y = 70°
y = 70 ÷ 10
y = 7
<QOR = 3y + 9
<QOR = 3(7) + 9
<QOR = 21 + 9
<QOR =
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C. 30°
Penjelasan dengan langkah-langkah:
Nilai y
<POR + <QOR = 90° (berpenyiku)
(7y + 11)° + (3y + 9)° = 90°
10y + 20° = 90°
10y = 90 - 20
10y = 70°
y = 70 ÷ 10
y = 7
<QOR = 3y + 9
<QOR = 3(7) + 9
<QOR = 21 + 9
<QOR =