Answer:
1. ( Yellow Circle )
A = πr²
A = 3.14 ( 2²)
A = 3.14 × 4
A = 12.56 cm²
2. ( Violet/Purple Circle )
A = πr²
A = 3.14 ( 5² )
A = 3.14 × 25
A = 78.5 m²
3. ( Orange/Red Circle )
A = πr²
A = 3.14 ( 23² )
A = 3.14 × 529
A = 1,661.06 mm²
4. ( Blue Circle )
A = πr²
A = 3.14 ( 39² )
A = 3.14 × 1521
A = 4,775.94 cm²
Tips/Clues in finding the area of a circle:
- Most people use 3.14 as the value of the pi (π).
- The letter r in the number sentence (A = π r² ) means radius which is the line segment or the length extending from the center of a circle or sphere to the circumference or bounding surface.
- The number at the top right of the radius (r² ) is called the "exponent". It tells you many times to use that number in a multiplication. For example, 5² is equivalent to 5x5 which has both the answer of 25. If the problem only gave the diameter of the circle, divide it into 2 because a diameter is twice the radius. I As an example, d = 10 which is r = 5.
Message:
These answers are opinionated by myself but the tips and clues that I gave you were facts. I am very sorry if these answers were wrong but I guarantee you these are correct.
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