Question

Please help me idk this

Answer 1

`\boxed{b=14cm}`

Explanation:

Altitude is a perpendicular line segment from a vertex of a triangle to the opposite side. This altitude is shown in the figure and is h = 21 cm. So we need to find b, that is the base of the triangle. From the formula:

`A=(bh)/(2)`

We can isolate b as follows:

`A=(bh)/(2) \\ \\ b=(2A)/(h) \\ \\ Substituting \ values: \\ \\ b=(2(147))/(21) \\ \\ \therefore \boxed{b=14cm}`