Find the circumference and the area of a circle with radius 4 cm
Please help!
2 answers:
Circumference: 2 * pi * r
pi = 3.14, r = 4
2 * 3.14 * 4 = 25.12
Circumference: 25.12 cm
Area = pi * r^2
pi = 3.14, r = 4
3.14 * 4^2 = 50.24
Area: 50.24 cm^2
Answer:
Circumference: 8πcm
Area: 16πcm²
Step-by-step explanation:
Circumference:
To find the circumference of a circle, use the formula c = 2πr, where r is the radius. Use 3.14 for pi.
r = 4
c = 2πr
c = 2(3.14)r
c = 2(3.14)4
c = 25.12cm
Area: To find the area of a circle, use the formula πr², where r is the radius. Use 3.14 for pi.
r = 4
a = πr²
a = (3.14)r²
a = (3.14)4²
a = (3.14)16cm²
a = 50.24 cm²
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Step-by-step explanation:
