Answer:
The area of the circle is 38.5 cm²
Explanation:
The rule of the area of a circle is A = π r², where
- r is the radius of the circle
- The radius of the circle is half the diameter of the circle r =
d
Let us solve the question
∵ The diameter of the circle is 7 cm
∴ d = 7 cm
∵ r =
d
→ Substitute d by 7
∴ r =
(7)
∴ r = 3.5 cm
→ Substitute the value of r in the rule of the area above
∵ A = π (3.5)²
∴ A = 12.25π
∵ π =
∴ A = 12.25 (
)
∴ A = 38.5 cm²
∴ The area of the circle is 38.5 cm²