Two different radioactive isotopes decay to 10% of their respective original amounts. Isotope A does this in 33 days, while isot
2 answers:
You might be interested in
Answer:
20.25 m²
Step-by-step explanation:
the area (A) and circumference (C) of a circle are calculated using the formulae
C = 2πr and A = πr² ( where r is the radius )
calculate the radius using the formula for circumference
2πr = 9π ( divide both sides by 2π )
r = =
= 4.5, hence
A = π × 4.5² = 20.25π m²
