Make r the subject of the formula:
A= πr²
2 answers:
Firstly, divide both sides by pi: 
Lastly, square root both sides of the equation and <u>your answer will be 
</u>
You might be interested in
Answer:
7 students.
Step-by-step explanation:
10% of 70 is 7.
Answer to first four-
first one- 2f+2f=60
4f=60
f=15
second one-18+2d=38
2d=20
d=10
(short side is 9)
third one-2a+a+5+a+5=26
4a+10=26
a=4
long side is 9
short side is 8
fourth one-3xy+3xy+xy=63
7xy=63
xy=9
long side is 27
*only p*
because there are no two digits the same in the x and y values
22. 36
23. 13/2
24. 1.1, -9.1
