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4x = 180°
x = 180° / 4
x = 45°
4x° = 180°
x° = 180° : 4
x° = 45°
X° = 45°
b. <SPR = 3x°
= 3 . 45°
= 135°
c. <PRQ = 180° -(x° +80°)
= 180° -(45° +80°)
= 180° -125°
= 55°
Itu jawabannya.