-1 Deepak BoraNewbie Asked: July 10, 20202020-07-10T20:06:53+05:30 2020-07-10T20:06:53+05:30In: CBSE Triangles : ∆ABC ~ ∆DEF. If AB = 4 cm, BC = 3.5 cm, CA = 2.5 cm and DF = 7.5 cm, find the perimeter of ∆DEF. -1 ∆ABC ~ ∆DEF. If AB = 4 cm, BC = 3.5 cm, CA = 2.5 cm and DF = 7.5 cm, find the perimeter of ∆DEF. please help me with this question this is simple question for class 10th CBSE board Similarity Chapter 6 chapter 6ncert class 10thsimilar trianglesimilaritytriangles Share Facebook 1 Answer Voted Oldest Recent Best Answer Deepak Bora Newbie 2020-07-13T23:55:38+05:30Added an answer on July 13, 2020 at 11:55 pm This answer was edited. Because triangle ABC ∼ triangle DEF ∴ perimeter of triangle ABC : perimeter of triangle DEF = AC : DF Perimeter of triangle ABC = 4+3.5+2.5 = 10cm 10 : perimeter of triangle DEF = 2.5 : 7.5 Cross multiplying Perimeter of triangle DEF = 10× 7.5/2.5 ∴ perimeter of triangle DEF = 30cm 6 Reply Share Share Share on Facebook Share on Twitter Share on LinkedIn Share on WhatsApp Leave an answerLeave an answerCancel reply Featured image Select file Browse Add a Video to describe the problem better. Video type Youtube Vimeo Dailymotion Facebook Choose from here the video type. Video ID Put Video ID here: https://www.youtube.com/watch?v=sdUUx5FdySs Ex: "sdUUx5FdySs". Click on image to update the captcha. Save my name, email, and website in this browser for the next time I comment. Related Questions Given that a,b,c are the sides of a triangle ABC which is right angled at C, then the ... Let s denote the semi-perimeter of a triangle ABC in which BC = a, CA = b, AB ... The perimeters of two similar triangles ABC and LMN are 60 cm and 48 cm respectively. If LM=8 ... D and E are the points on sides BC, CA and AB respectively. of a ΔABC such that ... In ΔABC, if ∠1 = ∠2, Prove that, AB/AC = BD/CD

This answer was edited.Because triangle ABC ∼ triangle DEF

∴ perimeter of triangle ABC : perimeter of triangle DEF = AC : DF

Perimeter of triangle ABC = 4+3.5+2.5 = 10cm

10 : perimeter of triangle DEF = 2.5 : 7.5

Cross multiplying

Perimeter of triangle DEF = 10× 7.5/2.5

∴ perimeter of triangle DEF = 30cm