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Sagot :
Answer:
4.5
Step-by-step explanation:
The two triangles are similar
so the equation is
[tex] \frac{a}{6} = \frac{15}{20} [/tex]
[tex]20a = 90[/tex]
[tex]a = \frac{90}{20} [/tex]
[tex]a = 4.5[/tex]
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