Please help dont understand

36.576 cm²

Step-by-step explanation:

We can simply figure out the hypotenuse of the triangle which is the diameter of our circle, then use the radius to get the area of the circle:

Since we have our diameter, the radius is simply ,  and finding the area of the circle becomes simple enough:

Therefore, the area of the circle is 36.576 cm²

cross multiplying, we get :

⇒ (3) × (5) = (9) × (x)

⇒ 15 = 9x