Answer:
#8 is 12.6 and #9 is 18.7
Explanation:
for 8, set up a^2+b^2=c^2 for the lower triangle to find that missing side in the middle. (a would be 10, b would be 25, and youre solving for c). then set up the same equation for the upper triangle to find x. ( youre solving for a, b is the "c" from the bottom triangle, and c is 28)
for 9, subtract 29 from 40 to find the total of both the bottom sides of those triangles. divide by 2 to get the length for one triangle. then set up a^2+b^2=c^2 (a would be that length you just solved for: 40-29 then divided by 2, youre solving for b, and c is 20 as marked in the other triangle)