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To draw the triangle do the following steps:
i) Draw BC as 8 cm.
ii) Now from point B draw an angle of 45⁰.
iii) Then mark 3.1 cm on 45⁰ line. Mark it as D. Join CD
iv) Draw the perpendicular bisector of CD and let it intersect the 45⁰ line. Mark that point as A. Join AC. ABC is the required triangle.

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⇒ take base bc as 8 cm
⇒ and b as center measure 45 degrees with the help of protractor .
⇒now take circular with radius 3.1 cut the line and mark as a .
now join the a and c now it is the required triangle abc

ab - ac = 3.1 cm

hope this helped u dear ...!! :-)
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