A semicircle has an area of 76.97 km² . Find its radius
2 answers:
Area of a semicircle = 1/2 πr²
1/2 πr² = <span>76.97
Multiply both sides by 2:
</span>πr² = 153.94
Divide both sides by π:
<span>r</span>² = 49
Square root both sides:
r=√49
r = 7
Answer: r = 7
Hello!
We first have to make the semicircle a whole circle
A semicircle is half a circle so we multiply the area by 2
76.97 * 2 = 153.94
Now we use the equation to find the radius when given the area which is

r is radius
A is area
Put in the values we know

Divide 153.94 by pi

Take the square root
r = 7
The answer is 7km
Hope this helps!
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