Answer:
9.8 sq. in.
Step-by-step explanation:
A = πr²
Diameter: 10 inches
Radius: 5 inches
A = π · 5²
A = π · 25
A = 78.54
Section 4 is about one eighth of the circle.
78.54 ÷ 8
9.8175
9.8175 ≈ 9.8
Answer:

Step-by-step explanation:
The diagram is shown in the attachment.
By the altitude -leg rule :

This implies that:

By cross multiplication:

Take square root to get:


Using the Pythagoras Theorem:




A1 = first term = 8
<u>Plug in a1 = 8:</u>
an = 8 + (n - 1)d
<u>FInd d:</u>
Given that a2 = 5
5 = 8 + (2-1)d
5 = 8 + d
d = -3
<u>Plug in d = -3:</u>
an = 8 -3(n - 1)
Answer: an = 8 -3(n - 1) ; <span>n ≥ 1</span>