Regular polygons: exterior angle = 360°/n

CAT has tested this idea 3 times across 3 papers, from 2019 to 2023. Solve one, and the others are the same method with different numbers or wording, which is why repeated concepts are the most efficient thing to practise.

Question	What it asks	Answer
CAT 2022 Slot 2 · QA Q3 near-repeat	sides 1:2, interior angles 3:4	10
CAT 2019 Slot 2 · QA Q11 near-repeat	b = 2a, interior angle ratio 3/2	150
CAT 2023 Slot 3 · QA Q19	interior exceeds exterior by 120°; diagonals	54

Part of Geometry (65 questions since 2017).