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irga5000 [103]
3 years ago
7

GEOMETRY PLZ HELP

Mathematics
1 answer:
Cerrena [4.2K]3 years ago
3 0

Answer:

Option B is true

Step-by-step explanation:

We are given that three right  triangles .Triangles ABD,CAD and CBA are similar.

When two triangles are similar then, the corresponding sidea are in equal proportion.

We have AB=5 units

AC= 7 units

BC=x

Triangles ABD is similar triangle CBA

\frac{AB}{BD}=\frac{BC}{AB}

AB^2=BC\cdot BD

(5)^2=BC\cdot BD

BC\cdot BD=25

When triangle CAD and CBA are similar

Then,\frac{AC}{BC}=\frac{CD}{AC}

AC^2=CD\cdot BC

(7)^2=CD\cdot BC

49=CD\cdot BC

In traingle CBA, uisng pythagoras theorem

AB^2+AC^2=BC^2

BC\cdot BD+BC\cdot CD=x^2

25+49=x^2

x^2=74

Hence, option B is true.

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