Perimeter and Area of Composite Figures > help?

An archery target has a diameter of 80 cm. It contains a circle in the centre with a radius of 8cm and four additional concentric rings each 8 cm wide. a) Find the area of the outer ring, to the nearest square centimetre. b) What percent of the total area is the outer ring? This is a question from the... show more An archery target has a diameter of 80 cm. It contains a circle in the centre with a radius of 8cm and four additional concentric rings each 8 cm wide.
a) Find the area of the outer ring, to the nearest square centimetre.
b) What percent of the total area is the outer ring?

This is a question from the perimeter and area of composite figures unit that I'm working on independently at the moment. So yeah if you have the answer to this question, I would really appreciate it. Please help me, asap. Oh & this is grade 9 academic math, hope that helps?
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