Question

Please help me idk this

Answer 1

Answer:

$\boxed{b=14cm}$

Step-by-step 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:

$A=\frac{bh}{2}$

We can isolate b as follows:

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