An octagon has 8 sides. Each side is 2a + 1 units.
8(2a + 1)
= 16a + 8
C=πr²
c=22/7*28²
c=22/7*784
c=(22*784)/7
c=22*112=2464

Actually Welcome to the Concept of the Volumes.
Volume = base area * Height
hence, here,
base area = 1/2(3)(4)
base area = 6 sq. inches,
now volume = 6 * height
==> Volume = 6*11 = 66 cubic inches
====> hence the volume of the triangular prism is 66 cubic inches.
Answer:
5
Step-by-step explanation:
The answer is 5 because all angles are congruent.