CAT Practice : Coordinate Geometry

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Substitute the value of external angle of an octagon and then continue!!

Area of Rhombus

    Q.21: Rhombus of side 6 cm has an angle equal to the external angle of a regular octagon. Find the area of the rhombus.
    1. 18 cm2
    2. 9 cm2
    3. 15 cm2
    4. 12 cm2


  • Correct Answer
    Choice (A).18 cm2

Detailed Solution

Side of the rhombus 's' = 6 cm
Angle between sides 'a' = exterior angle of an octagon
Therefore a = 45 degrees
Area of rhombus = sin a * s2

Area = * 36

Area = 18 cm2

Correct Answer: 18 cm2

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Geometry is probably the most vital topic as far as CAT preparation is concerned. Geometry sets the stage for Trigonometry, Cogeo and Mensuration as well.