Answer:
18
Step-by-step explanation:
30-60-90 triangles have a set of x values that you can plug your numbers into.
we know that the side length opposite to 30 is x
the side length opposite to 60 is xsqrt3
the side length opposite to 90 is 2x
from this we can gather that y=2x where x=9 therefore y=18
Six congruent isosceles triangles would be named as their letters (must be in order!) then isosceles.
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Number 8 is C. I'm still trying to figure out what number 7 is.
The answer is <u>174 in2</u> I took the quiz K12 and got it correct. Good luck!