book Maths Puzzle Numerical Ability

I have an isosceles triangle with a 45deg angle between. What is the formula for finding the length of the third side?

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book Other Question

a ground storage tank is 60' wide, 120' long, and 12' deep. How many gallons of water will it hold? how did u get this answer thank u joe. How do i factor the trinomial; 6x2 + 8x + 2? ( 6x2 means 6x squared)

thanks