0 Deepak Bora 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. 0 ∆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 Related Questions The model of a building is constructed with the scale factor 1:30. (i) If the height of the ... On a map drawn to scale of 1 : 2,50,000 a rectangular plot of land ABCD has the ... On map drawn to a scale of 1 : 250000, a triangular plot of land has the following ... Two isosceles triangles have equal vertical angles and their areas are in the ratio 7:16. Find the ratio ... ABC is a right angled triangle with ∠ABC=90 o . D is any point on AB and DE ... 1 Answer Voted Oldest Recent Deepak Bora 2020-07-13T23:55:38+05:30Added an answer on July 13, 2020 at 11:55 pm 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 0 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.

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