Answer:
radius = 5 units
area of a circle = 15.7units²
Step-by-step explanation:
given that the circumference of a circle = 31.4
radius = ?
recall that the formulae for finding the circumference of a circle = 2πr
circumference of a circle = 2 x 3.14 x r
31. 4 = 6.28r
divide both sides by the coefficient of r which is 6.28
31.4/6.28 = 6.28r/6.28
5 = r
radius = 5 units
therefore the radius of the circle whose circumference is 31.4 units is evaluated to be 5units
to find the area of the circle
recall the formula = πr²
area of a circle = 3.14 x 5²
area of a circle = 3.14 x 25
area of a circle = 15.7units²
Answer:
63
Step-by-step explanation:3(3)(7)=63
The best answer would be C
#1 center (9,6) radius = 10
#2 center (4,-2) radius = 4 square root 2
#3 center (-3,-8) radius = 9
#4 center (-6,5) radius = 2 square root 2
Answer:
area of the circle = 3.14 square units
Step-by-step explanation:
Circumference of the circle formula is
where r is the radius of the circle
given circumference = 6.28
= 6.28
Value of pi is 3.14
2*3.14 * r= 6.28
6.28 r = 6.28
divide by 6.28 on both sides
r = 1
radius = 1
Area of the circle =
= 3.14 *1*1 = 3.14