Question

The areas of two similar triangles ABC and DEF are 81 cm2 and 100 cm2 respectively. If EF = 5 cm,

then find BC. pls reply properly​

Answer 1

Step-by-step explanation:

Answer

Since the triangles are similar .

ar(ΔDEF)ar(ΔABC)=(EFBC)28136=(6.9BC)296=6.9BCBC=96×6.9=4.6cm

Answer 2

Answer:

ABC/DEF=BC2/EF 2

81/100=BC2/(5)2

81×5×5/100 =BC2

81×25/100=BC2

81/4=BC2

9/2=BC

BC=4.5

Ans:BC=4.5