Answer:
The Unknown side of the triangle is 13.19
Step-by-step explanation:
To find it you would draw a rectangular prism and you would draw a triangle in the rectangular prism then you would draw another triangle with the length of 7cm and he width x and so your equation would be [tex]y^{2} = 7^{2} +x^{2}[/tex] so first you would find x and so since the rectangular prism width is 10 and the length is 5 you would do [tex]x^{2} =5^{2} +10^{2}[/tex] so then your equation would be [tex]y^{2} =7^{2} +5^{2} +10^{2}[/tex] do the math that would give you [tex]y^{2} = 174[/tex] then you would do [tex]y = \sqrt{174} = 13.19[/tex] and so your answer is 13.19
I hope I didn't write to much
