The diameter of this circle is 90mm calcualte its radius and area?

Answer 1

r = 45 mm
A = π (45)² mm²
A = 6362 mm² (to nearest mm²)

Answer 2

This i will provide help to with! ok, the area of a circle is the radius squared (expanded by way of itself) circumstances pi. So, sixty 4 represents the radius squared. to locate the radius, you ought to locate the sq. root of sixty 4. This quantity squared equals sixty 4. the respond, of course, is 8cm. The diameter is much greater handy. in basic terms multiply the radius by way of two. this supplies 16cm. finally, to locate the circumference, you ought to comprehend the formula for the circumference of a circle. it incredibly is C = pi(d). nicely, you comprehend that pi equals 3.14, in a feeling, and the diameter (d), that's 16cm. So, in basic terms multiply it out, and you will then have all your solutions. Now, in case you're thinking approximately why there are not any "decimals rounded to the closest hundredth", that is with the aid of fact each and every so often the individuals who write those questions upload in that area to throw you off, so do not complication approximately it. :)

Answer 3

Radius = Diameter/2 = 90/2 = 45mm

Area = pi * r^2 = 3.14 * (45)^2 = 6361.73 mm^2

Answer 4

Diameter is 2 X radius.
Area is pi x radius squared.

Answer 5

Radius = 45mm
Area = Approximately 6358.5 mm^2
or
Radius = Approximately 1.77 in
Area = Approximately 9.86 in^2

pi = 3.14

Answer 6

It is elementary Geometry.
Area = Pi x (r x r) {Pi = 22/7}
radius =1/2 diaameter

These are not questions thru YAHOO, please.

Answer 7

A = *pi* x r (squared)

3.14... x 45 x45 = you can work it out

Answer 8

i wish I could get people to do my homework for me when I was your age......

Answer 9

you should be able to do that:

D=2r
A=(pi)r^2

Answer 10

pfft. i dont know