The triangle ABC passes through the centre of the circumscribed circle.

The area of triangle ABC = 643.5cm^{2}

The perimeter of triangle ABC = 143 cm

Find the area of the circle in terms of pi.

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Diameter D

Perimeter P

Area A

D = (P^2 -4A)/(2P)

ouch!

Unless my brain is not awake at 7am

how did you get this Howard?

correct ðŸ™‚

Now if the area was 6 and the perimeter was 12 it would save one in two hundred kids a lot of time.

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