ΔABC ~ ΔPBR, BC = 8 cm, AC = 10 cm , ∠B = 90°, BCBR=54 then construct ∆ABC and ΔPBR - Geometry Mathematics 2

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Diagram

ΔABC ~ ΔPBR, BC = 8 cm, AC = 10 cm , ∠B = 90°, `"BC"/"BR" = 5/4` then construct ∆ABC and ΔPBR

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Solution


Analysis: In ∆ABC, ∠B = 90°    ......[Given]

∴ AC2 = AB2 + BC2    ......[Pythagoras theorem]

∴ 102 = AB2 + 82

∴ AB2 = 100 – 64

∴ AB2 = 36  

∴ AB = 6 cm     ......[Taking square root of both sides]

Steps of construction:

  1. Draw seg BC of length 8 cm.
  2. Take ∠B as 90° and draw an arc of 6 cm on it. Name the point as A.
  3. Join seg AC to obtain ∆ABC.
  4. Draw ray BX such that ∠CBX is an acute angle.
  5. Locate points B1, B2, B3, B4, B5 on ray BX such that, BB1 = B1B2 = B2B3 = B3B4 = B4B5.
  6. Join point C and B5.
  7. Through point B4 draw a line parallel to seg CB5 which intersects seg BC at point R.
  8. Draw a line parallel to AC through R to intersect line AB at point P.
    ∆PBR is the required triangle similar to ∆ABC.
  Is there an error in this question or solution?
Chapter 4: Geometric Constructions - Q.4

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