Dit : a) nilai X b) sudut dbc

Garis dan Sudut

No.1
a) nilai X
<ABD + <DBC = <ABC
52 + 2X - 60 = 90
2X - 8 = 90
2X = 90 + 8
2X = 98
X = 98/2
X = 49

b) <DBC
<DBC = 2X - 60
<DBC = 2 x 49 - 60
<DBC = 98 - 60
<DBC = 38°

No.2
a) nilai X
<QPR + <RPS = <QPS
9X - 20 + X + 10 = 90
10X - 10 = 90
10X = 90 + 10
10X = 100
X = 100/10
X = 10

b) <QPR
<QPR = 9X - 20
<QPR = 9 x 10 - 20
<QPR = 90 - 20
<QPR = 70°

c) <RPS
<RPS = <QPS - <QPR
<RPS = 90 - 70
<RPS = 20°

*semoga membantu. sukses selalu ^_^