The formulas for the circumference and area of a circle are

So, if we isolate the radius from the formula for the circumference we have

And if we substitute this expression for the radius in the formula for the area, we have

So, if you plug your value you have

Answer:
£290.70
Step-by-step explanation:
50x5=250
20x2=40
10x7=70
5x3=15
total = 375
375/1.29=290.697
= £290.70
Answer:
10
hope this helps
have a good day :)
Step-by-step explanation:
Answer:
16.2$
Step-by-step explanation:
Price of the notebooks: 15$
Tax Rate: 8%
Tax: 15$ * 8% = 1.2$
Price after Tax: 15$ + 1.2$ = 16.2$