Find the area of the given circle. Round to the nearest tenth.
3.5cm
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A) 22.0 cm
B) 38.5 cm
C) 11.0 cm
D) 42.8 cm
Area = pi * r^2
Don’t know if 3.5cm is radius or diameter. Area is in cm^2.
To find the area of a circle, you can use the formula A = πr^2, where A represents the area and r represents the radius of the circle.
Given that the radius of the circle is 3.5 cm, we can plug this value into the formula:
A = π(3.5 cm)^2
Calculating the expression inside the parentheses:
A = π(12.25 cm^2)
Using a value of π ≈ 3.14 and rounding to the nearest tenth:
A ≈ 3.14(12.25 cm^2)
A ≈ 38.465 cm^2
Rounding the answer to the nearest tenth gives us:
A ≈ 38.5 cm^2
Therefore, the area of the given circle, rounded to the nearest tenth, is 38.5 cm^2, which corresponds to option B).
To find the area of a circle, you can use the formula A = πr^2, where A represents the area and r represents the radius of the circle.
In this case, the radius of the circle is given as 3.5 cm. We can substitute this value into the formula to find the area:
A = π(3.5)^2
Now, let's solve this equation to find the area.
A = π(3.5)^2
A = π(12.25)
A ≈ 38.48 cm^2
Since we need to round the area to the nearest tenth, the area of the given circle is approximately 38.5 cm^2.
Therefore, the correct answer is B) 38.5 cm.