Answer:
12.5
Step-by-step explanation:
We see in the other triangle that the ratios is 2:5 (4 to 10).
Therefore, assuming they are similar, we can assume the ratio is the same for the missing triangle.
So,
10/4 = 2.5
5(given) x2.5 = 12.5
7.7
10² - 4² = 84
√84 = 9.16 so 9.2
now we now have the hypotenuse of the other triangle
9.2² - 5² =59.64
√ 59.64 = 7.72 so 7.7
