Day 39 of 60 · Sat 7 Nov · Daily workbook · CAT in 22 days

Day 39: Quadrilaterals & Polygons + Games & Tournaments Set + Technology RC

Day 39 of the free ThinkCAT 60-day CAT challenge: 5 quadrilaterals & polygons questions and 3 spaced-review QA questions, a full games & tournaments DILR set (6 questions), a technology RC passage (5 questions), plus para jumbles and odd one out. Every question is a real CAT PYQ.

QA · 8
DILR · 6
VARC · 7
45 minutes
Real CAT questions

Concept card

Quadrilaterals & Polygons

Core formulas

Rhombus: area = d₁d₂/2, diagonals perpendicular
Trapezium: area = ½ × (sum of parallel sides) × height
Polygon: interior angles add to (n − 2) × 180°; exterior to 360°
Diagonals of an n-gon = n(n − 3)/2; regular hexagon area = (3√3/2)a²

60-second shortcut · Exterior angle first

Exterior angle 36° ⇒ n = 360/36 = 10 sides ⇒ 10 × 7/2 = 35 diagonals.

Trap box

Looks like: Diagonals = n(n − 1)/2Actually: That counts the sides too: n(n − 3)/2
Looks like: Exterior angles add to (n − 2) × 180°Actually: They always add to 360°

From the free Geometry Formula Sheet (PDF).

What's in Day 39

QA: Quadrilaterals & Polygons (5) + 3 spaced-review questions
DILR: Games & Tournaments set, 6 questions
RC: Technology passage
VA: Para Jumbles, Odd One Out

Year, slot and question number for each question appear with the answer key after you submit.

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