- Sequential Output Tracing (Input Output)
- Syllogism
- Critical Reasoning: Assumptions & Conclusions
- Relationships
- Cause & Effect
- Circular Arrangement
- Coding-Decoding
- Complex Arrangements
- Critical Reasoning: Course of Action
- Critical Path
- Direction and Word Puzzle
- Games And Tournaments
- Linear Arrangement
- Team Selection
- Venn Diagram
- Bar Graphs
- Data Sufficiency
- Line Graph
- Pie Chart
- Tables and Caselets

1. A circle is inscribed in a rhombus with diagonals 12 cm and 16 cm. The ratio of the area of circle to the area of rhombus is

**[CAT 2020]**

Area of rhombus = 12*16/2 = 96

Let h = radius ; a = diagonal1; b = diagonal2

a = 12

b = 16

AB^2 = (a/2)^2 + (b/2)^2 = 6^2+8^2 = 36+64 = 100

AB = 10

(a/2 * b/2) / 2 = AB * h/2

6*8 = 10*h

H = 4.8

Area of circle = Pi * 4.8 * 4.8

Ratio of areas = Pi * 4.8 * 4.8 /96

On solving = Pi * 6/25

2. In a circle of radius 11 cm, CD is a diameter and AB is a chord of length 20.5 cm. If AB and CD intersect at a point E inside the circle and CE has length 7 cm, then the difference of the lengths of BE and AE, in cm, is

A) 2.5 B) 3.5 C) 0.5 D) 1.5 [CAT 2019]

As per question following figure can be drawn,

As we know AE*BE = CE*DE

X(20.5 –x) = 7*15 = 105

20.5x –x^2 = 105

x^2 -20.5x + 105 = 0

x^2 -10.5x – 10x +105 =0

(x -10)*(x-10.5) =0

So x = 10 or 10.5

Thus if AE = 10 then BE = 10.5 and vice versa

Required difference = (10.5 -10) = 0.5

3. Two circles, each of radius 4 cm, touch externally. Each of these two circles is touched externally by a third circle. If these three circles have a common tangent, then the radius of the third circle, in cm, is

A) π/3 B) 1/√2 C) √2 D) 1 [CAT 2019]

See the figure,

In above figure, AD=BD =4, let radius of 3rd circle = r

So AC = 4+r, CD = 4-r

Using Pythagoras theorem in right angled triangle ADC,

AC^2 = AD^2 + CD^2

(4+r) ^2 = 4^2 + (4-r)^2

16+ r^2 + 8r = 16 + 16 + r^2 – 8r

4. In a circle, two parallel chords on the same side of a diameter have lengths 4 cm and 6 cm. If the distance between these chords is 1 cm, then the radius of the circle, in cm, is

A) 12 B) √14 C) √13 D) √11 [CAT 2018]

The list of concepts that are covered in basic CAT Geometry are as follows: –

- Basic Properties of Triangle Geometry: – Some basic properties are given below: –

- The sum of the three interior angles is 180 degrees.
- The measure of an exterior angle is equal to the sum of the measures of two remote interior angles.
- The sum of the three exterior angles is 360 degrees.
- The side opposite to the greatest angle is the longest, and the side opposite to the smallest angle is the shortest

- Types/Sides of Triangles: For eg: – Consider an obtuse triangle with sides 8cm, 15cm & x cm. How many such triangles are possible?
- Congruency/Similarity of triangles: – For eg: – How many noncongruent triangles are possible such that their sides are integers, and the perimeter is equal to 14.
- Some basic geometry concepts like Important theorems / formula / methods in geometry to study: –

- Angle Bisector Theorem
- Pythagoras Theorem
- Midpoint Theorem
- Basic Proportionality Theorem
- Heron’s Formula
- Trigonometric Formulas
- Determinant Method

- Some Important Lines and Points to Study in geometry are: –

- Altitude
- Orthocentre
- Perpendicular Bisector
- Circumcentre
- Median
- Centroid
- Angle Bisector
- Incentre

- Find the angle / sum of angles of the shape inscribed in another shape.
- Find the length of a side/sides, area of the shape, or shape inscribed within another shape.

- Students can learn the basic concept in CAT Geometry and properties of different shapes / lines-triangles, circle, rectangles, polygons, parallel lines, perpendicular lines, etc by using MBAP CAT E-book (Concept Theory) study material.
- Students should develop diagnostic skills to draw and find solutions by referring to MBAP Live Lecture Recordings (Basic) on the basic concepts.
- Students need to have the skill to identify which concept / method / formula / theorem to use. These skills can be gained by the students by practicing from MBAP CAT E-book (Practice questions) and also by taking up MBAP lecture Assignment.

- Topics such as congruency / similarity of triangles, shape inscribed inside another shape, theorems in geometry are focused intensively. So, students need to prepare well and practice problems on geometry.
- The geometry section in the QA is one of the easiest sections to attempt if the students have done their part properly. It is recommended that students should use MBAP Topic Wise Previous Year CAT Questions to practice and ace this section in the exam.

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