Answer:
12.5m
Step-by-step explanation:
The missing length is the hypothenuse, the formula to calculate the hypothenuse is
[tex]c = \sqrt{a {}^{2} + b {}^{2} } [/tex]
[tex]c = \sqrt{10 {}^{2} + 7.5 {}^{2} } \\ c = \sqrt{100 + 56.25} \\ c = \sqrt{156.25} \\ c = 12.5[/tex]
