9π units²
Step-by-step explanation:
To obtain an exact answer, use π, not an approximation such as 3.14.
A = πr² is the appropriate formula.
Here,
A = (3)^2·π units², or 9π units²
ad = ae + ed = y + 7
similar triangles therefor
ac/ab = ad/ae
6/4 = (y + 7) / y
cross multiply
6y = 4(y + 7)
6y = 4y + 28
2y = 28
y = 14
step-by-step explanation: