Answer:
Let R be the greater radius and r be the smaller radius
A) Area of the sidewalk = R^2 - r^2 - This can be the expression
B) = 3.14
=(R^2-r^2)
=(11^2-9^2)
=(121-81)
=*40
That was the simplified expression
Answer = 3.14 * 40 = 125.6m^2
Step-by-step explanation:
Use the formula 1/2(base1+base2)height. Substitute the values.
hopefully this answer can help you to answer the next question
Answer:
1/2
Step-by-step explanation:
