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:
8
Step-by-step explanation:
AC=AB+BC
2X+26=1+x+16
2x-x=1+16-26
X= - 9
Now, AC=2X+26
=2*-9+26
= - 18+26
=8
Look at the sides of the triangles. find the sides that are corresponding, or matching.