Answer:
The area of the semi-circle is 35.8 cm².
Step-by-step explanation:
The length of the arc is given by:
(1)
Where:
s: is the length of the arc of semi-circle = 15 cm
r: is the radius
θ: is the angle in radians
Since we need to calculate the area of the semi-circle, the angle is:
From equation (1) we can find the radius:
Now, the area of the semi-circle is:
Therefore, the area of the semi-circle is 35.8 cm².
I hope it helps you!