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1. Banyak titik sudut = O, P, Q, R, S ===> 5 titik sudut
Nama nama sudut = <QPO, <QPR, <QPS, <QOP, <QOR, <QRS, <QRO, <QRP (maaf klo ada yang gk ketulis)
2. (2x + 5) + (3x - 10) = 180° (karena garis lurus)
5x + 5 - 10 = 180°
5x - 5 = 180°
5x = 180 + 5
= 185°
x = 185 ÷ 5
= 37°
3. x + 2x = 90° (karena siku-siku)
3x = 90°
x = 90 ÷ 3
= 30°