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Earlier discussion
2 older comments kept for context.
Chisom
The sum of the first 20th term of the progression 3,6,23….is
Oluwaseun Adeyemi
\(\pi\) = \(\frac{22}{7}\), Diameter D = 42m
Area of a circle = \(\frac{\pi D^2}{4}\) when a diameter is given
area of a semicircle \(\frac{\pi D^2}{4}\) x \(\frac{1}{2}\)
= \(\frac{22}{7}\) x \(\frac{4262}{4}\) x \(\frac{1}{2}\)
= \(\frac{11}{7}\) x 441
= 693m2