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Construct a parallelogram ABCD, when: AB = 4.5 cm, ∠B = 120° and the distance between AB and DC = 3.0 cm. - Mathematics

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Question

Construct a parallelogram ABCD, when:

AB = 4.5 cm, ∠B = 120° and the distance between AB and DC = 3.0 cm.

Sum
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Solution

Steps:

  1. Draw AB = 4.5 cm.
  2. At B, draw BP ⊥ AB.
  3. From BP cut BE = 3 cm.
  4. Through E, draw a perpendicular to BP to get QR parallel to AB.
  5. Draw BP, such that ∠B = 120°.
  6. Let BP intersect QR at C.
  7. With A as center and radius = BC, draw an arc cutting QR at D.
  8. Join AD, BC and CD.

ABCD is the required parallelogram.

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Construction of Parallelograms
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Chapter 15: Construction of Polygons (Using ruler and compass only) - Exercise 15 [Page 190]

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Selina Concise Mathematics [English] Class 9 ICSE
Chapter 15 Construction of Polygons (Using ruler and compass only)
Exercise 15 | Q 13 | Page 190
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