Answer:
Step-by-step explanation:
look at the drawing as two HALF circles and substract the larger half circle from the smaller half circle or the difference between two circles divided by two
A = π r² for a WHOLE circle A / 2 is the area for a HALF circle
Area of the rainbow is Large Circle Area / 2 - Small Circle Area / 2
= (π r²/2 large - π r²/2 small)
= (π r² large - π r² small) / 2
= π( r² large - r² small) / 2
= π ((18cm)² - (12cm)²) / 2
= π(324 -144)cm² / 2
= 282.74 <---------------- FINAL ANSWER
