Use π=22/7 for the following questions. 1) Tom ran 4 times around a circular track of diameter 28m. What distance did he cover?

2) The radius of a bicycle wheel is 21cm. How many complete revolutions will the wheel make in travelling 1km.

3) A circumference of a circle is 1386cm. Given that π= 22/7, What is the radius of the circle?

4) A circular track has a radius of 70m. If an athlete runs around it twice, how far has he run?

5) A piece of wire is bent to from a square of area 484cm^2.

a) calculate:
i. The Length of each side of the square.
ii. The perimeter of the square.

b) The same piece of wire is bent to from a circle. calculate:

i. The radius of the circle.
ii. The area of the circle.​

the answer is b: 18

step-by-step explanation:

use the pythagorean theorem to .

a^2+b^2=c^2

plug 18 for "r"

the 2 legs are 18 and 24

18^2+24^2=c^2

324+576=c^2

900=c^2

c=30

30-12=18

18 is the radius

: )

570, the answer is 570, hope it

you are playing an adventure game on your computer. you come across a troll who won't let you pass and there is no other way to get to the other side of the river except over the bridge he is guarding.

the troll is a nerd. he takes great delight in watching people struggle with his problems. very few get them. he only gives you one chance and then he changes the puzzle. you have to solve this one.

before you are four blocks. they are numbered 11,6, -7,21.

he tells that the answer he wants is minus and between -1 and - 2. you can use +, -, ×, ÷   ( and ) as many times as you like or no times at all. you don't like the way he's looking at you, but you need to cross the bridge. what do you do?