The third one and forth one are right.
It just has to equal 90° so that they are parallel so 16x-6=90
16x=96 (add 6 to both sides)
x=6(divide by 16)
Answer:
2 1/4
Step-by-step explanation:
In an equilateral triangle, all 3 sides are the same length. If one side length is x, the perimeter is x+x+x or 3x which is equal to 6 3/4 as said in the problem. You get the equation 3x=6 3/4. Dividing both sides by 3, you get x=2 1/4.
Triangle=1/2 rectangle
so therefor a rectangle with similar legnth widht and height has 2 times the vollume of this prism
find volume and half it
V=LWH
V=16*12*8*
V=1536
half it
V=768
volume=768 cm^3