The area of a semi circle is 130cm. Find it's total perimeter?
1 Answer
Jun 18, 2018
Explanation:
The units are wrong in the question - an area must have square units, not unsquared units of length. I assume that it should read "130
The area of a circle is
The perimeter of a semicircle is half the circumference of the circle (whole circumference =
So we deduce the radius
and then deduce the perimeter from the radius:
Numerically, this is 33.1 cm, to three significant figures.