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5p+80=180
5p=100
p=20
Maka,
(2p +51)° +(3p +29)° = 180°
5p° +80° = 180°
5p° = 180° -80°
5p° = 100°
p° = 100°/5°
p° = 20°
Jadi, nilai p° adalah 20°.