An octagon has eight sides
1. 27
2=77
Your angles have to equal 90 and 180 degrees
So you would have to subtract from the angles and the numbers
The first one is 17.7 after rounding off
a2+b2=c2
b2=19^2-7^2
b=17.664
The second one is 108
Volume of a prism=base area x length
=(1/2 x12.6x1.6) x 10.75
=108.36mm3
Answer:
Point C is the reflection of point D, over the x axis and then they y axis