Explanation:
a=360°-300°=60°{reflex angle}
b=180°-40°=140°{straight angle}
hope it helps.
For a
a + 300° = 360° { being complete turn }
a = 360° - 300°
a = 60°
For b
b + 40° = 180° { being linear pair }
b = 180° - 40°
b = 140°
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