What series of transformations map triangle △abc onto △edf to prove that abc≅edf ? translation 3 units up then a reflection across x-axis translation 3 units down then a reflection across y-axis translation 3 units down then a reflection across x-axis translation 3 units up then a reflection across y-axis

translation 3 units down then a reflection across x-axis

Step-by-step explanation:

In the given figure, we can see that Δ ABC is vertically 3 units away from the x axis .

So we translate  Δ ABC by 3 units down and then reflect it across x axis to get ΔDEF.

step-by-step explanation:

given perimeter: 28cm

length: 9cm

atp,

2(l+w)=p of the reactangle

2(9+x)=28

18+2x=28

2x=28-18

x=10/2

x=5

therefore width is 5 cm