Answer:
105
Step-by-step explanation:
By solving for the other triangles, we know that the angles of a triangle add up to be 180 degrees. The angle for the triangle on the left is 25 and for the triangle on the right is 50. So we have the measurements, 25, 50 and x for our middle triangle from which we can see x=105
<u>Given</u>:
Given that the diameter of the circle is 10 kilometers.
We need to determine the area of the circle.
<u>Radius of the circle:</u>
The radius of the circle can be determined using the formula,

Substituting d = 10, we get;


Thus, the radius of the circle is 5 kilometers.
<u>Area of the circle:</u>
The area of the circle can be determined using the formula,

Substituting r = 5, we get;



Thus, the area of the circle is 78.5 square kilometers.