The area of deltoid is defined by formula:

Where e and f are diagonals.
If you were to double the size of either one. Let's say f. You would result with:

Which means if either of diagonals double in length the area of deltoid will be twice as big as it was before.
Hope this helps.
r3t40
Answer:
C.) -2
Step-by-step explanation:
solve by putting 12 in for f(x)
12 = 2(x + 8)
Divide by 2
6 = x + 8
Subtract 8
-2 = x
The nearest tenth means 1 decimal place.
so the answer is 8.5
Answer:
13
Step-by-step explanation:
17-10+6
7+6=13
hope it helps