calling on mathmaticians..................?

Question

I have 3 problems i need solved.
1. The area of a square piece of cardboard is 81 sq inches. what is the length of the cardboard?

2. A round barbecue pit is 2 meters in diameter. what is the distance around the barbeque pit?

3. An earthquake was felt throughout a circular area of 1,808.64 sq miles. what was the radius of the circular area?

than you all so very very much

Answer 1

1) sqrt81=9 Length=9inches
Area sqyare =lenghtxlenght
2) 2pi(2/2)=2pi=6.28
circumference of circle=2pi(r)
3)r=23.99=24.0miles---
pi(r^2)=area

Answer 2

1. If you have a square piece of cardboard that is 81 sq inches, then your length and width is 9.
The length is 9 inches.

2. If you have a circle with a diameter of 2 meters, then you have a radius of 1, thus the distance around your barbecue would be 2 pi. The equation for the circumference of a circle is 2*pi*r.
The distance around the barbecue pit is 2 pi meters or approximately 6.28319 meters.

3. If the area of your circle is 1,808.64; you would use the formula for the area of a circle pi*r^2.
pi*r^2 = 1808.64
divide both sides by pi to get approximately
r^2 = 575.71
take the square root of both sides to get approximately
r = 23.99
The radius of the circular area would be approximately 23.99 miles.

Answer 3

1. Say Length is L
So L^2=81
L= Sqr 81=9 inch Ans.
2. Distance=pi*d=22/7*2=44/7 meters Ans.
3.pi*r^2=1808.64
so r^2=1808.61/pi
r=sqr(1808.61/pi) miles Ans.

Answer 4

ans.1 area = length^2
81=l^2
l = 9 inch

ans.2 d=2r
radius= 1m
distance= 2*22/7*r
= 44/7m

ans.3 area of circle= 22/7 r^2
1808.64= 22/7 r^2
7*1808.64/22 = r^2

Answer 5

1. area = length x width

==> a = lw

For a square l = w, so you have l²...or w²...whichever you prefer to use.

==> a = 81 = l²
==> l = √81 = 9


2. circumference C = πd

plug in 'd' and you're all set.

3. circular area A = πr²

==> r = √(A/π)....plug your numbers in and you're good to go. Don't forget to use the units. I leave them off for clarity.

Answer 6

1. The length is square root of the square which is 9 inches

2. The formula is pie * diameter which is 3.142 * 2m = 6.284 m

3. pie * radius * radius = 1,808.64
3.142 * radius * radius = 1,808.64
radius * radius = 1,808.64 / 3.142
radius * radius = 575.633
radius = 23.99 miles

Hope this is what u wan.

Answer 7

you decide on the stairs to distribute (a-b) to (a^2 + ab + b^2)? through fact I understand this (a-b) (a^2 + ab + b^2) through fact the distinction of cubes whilst factored, i visit repeat from my math e book the way the formulation is derived. (a-b)(a^2 +ab +b^2) =a(a^2 + ab+b^2)- b(a^2 + ab+b^2) They broke up the (a-b) and dispensed it. = a^3-a^2b + ab^2 - a^2b - ab^2 - b^3 They did the allotting and as quickly as they integrate like words they're left with (a^3 - b^3).

Answer 8

1. 9 inches
2. 6.28 meters
3. 24 MILES