Incircle of a right triangle: r = (a + b − c)/2

CAT has tested this idea 3 times across 3 papers, from 2021 to 2024. 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 2024 Slot 1 · QA Q19	triangle ADE inside a rectangle	10
CAT 2024 Slot 2 · QA Q14	right triangle from coordinates	2
CAT 2021 Slot 1 · QA Q14	inradius 4 and one leg 10; area	120

Part of Geometry (65 questions since 2017).