2 years ago

What is the circumference of a circle with a diameter of 50 mm?

Mathematics

1 answer:

Doss [256]2 years ago

3 0

157.1 mm

C x d
3.14 x 50

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cupoosta [38]

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The circle C has centre A(2,1) and passes through the point B(10,7). Find and equation for C

Semmy [17]

The equation of a circle:
$(x-h)^2+(y-k)^2=r^2$
(h,k) - the coordinates of the centre
r - the radius

$A(2,1) - \hbox{the centre} \\
h=2 \\ k=1 \\ \\
(x-2)^2+(y-1)^2=r^2 \\ \\
\hbox{passes through B(10,7)} \\
x=10 \\
y=7 \\ \\
(10-2)^2+(7-1)^2=r^2 \\
8^2+6^2=r^2 \\
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\hbox{the equation:} \\ \boxed{(x-2)^2+(y-1)^2=100}$

7 0

2 years ago

The area of a square is 49 cm^2. What is the perimeter, in cm, of the square?

rewona [7]

Answer:

P = 28 cm

Step-by-step explanation:

The area of a square is

A = s^2 where s is the side length

49 = s^2

Taking the square root of each side

sqrt(49) = sqrt(s^2)