find area of cirle 3.9cm radius to nearest tenth?
a=pie 3.14 x r squared
3.14 x 3.9(15.21)
3.14 x15.21 =47.75
nearest tenth =47.8cm squared
is this the correct answer?
Yes, you are right!
need help with math
Yes, your calculations are correct. The area of a circle with a radius of 3.9 cm, using the formula A = πr^2, is 15.21 cm^2. Rounding to the nearest tenth, the answer is 15.2 cm^2. However, in your final answer, you have rounded it to 47.8 cm^2 instead of 15.2 cm^2. So, the correct answer is 15.2 cm^2, not 47.8 cm^2.
Yes, your calculation is correct. 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, you have a radius of 3.9 cm. So, substituting that value into the formula:
A = 3.14 x (3.9)^2
A = 3.14 x 15.21
A ≈ 47.75 cm^2
Rounding to the nearest tenth, the area of the circle with a radius of 3.9 cm is approximately 47.8 cm^2.