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rjkz [21]
3 years ago
9

What is the length of DE

Mathematics
2 answers:
irina1246 [14]3 years ago
8 0
The answer is b.6, you set up a proportion of the corresponding sides in both triangles...12/9=8/x solve for x and get 6.
kotegsom [21]3 years ago
6 0

Answer:

The correct option is B.

Step-by-step explanation:

Given information: XY=9, YZ=12, XZ=12, DE=x, EF=8, DF=8, ∠Z=44°, ∠F=44°.

In triangle XYZ and DEF,

\angle Z=\angle F=44^{\circ}               (Given)

\frac{XZ}{YZ}=\frac{12}{12}=1

\frac{DF}{EF}=\frac{8}{8}=1

\frac{XZ}{YZ}=\frac{DF}{EF}

Since two corresponding sides are proportions and their included angle is same, therefore triangle XYZ and DEF are similar.

Corresponding sides of similar triangles are proportional.

\frac{XY}{DE}=\frac{YZ}{EF}

\frac{9}{x}=\frac{12}{8}

\frac{9}{x}=\frac{3}{2}

On cross multiplication we get

9\times 2=3x

18=3x

Divide both sides by 3.

6=x

The length of DE is 6 units. Therefore the correct option is B.

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