Respuesta :

prashanna7paudel

Answer:

10m

Step-by-step explanation:

Use the area of triangle:

Area of triangle =

[tex] \frac{1}{2} \times base \: \times height[/tex]

1/2 × b × 3 = 15

b × 3 = 30

b = 30/3

b = 10

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