Question

Solve this! Given AB= 5, which of the following is equal to BC ?

Answer 1

Answer: C

Explanation:

the rule for a 45 45 90 triangle is

the legs are proportionally x

and the hypotenuse is x√2

AB is a leg, which is x =5

BC is hypotenuse = x√2 = 5√2

or if you don't remember rules use pythagorean

c²=a²+b² in this problem a and b are the same since the 2 angles are the same

c²=5²+5²

c²=25+25

c²=50

c=√50

=
`√(25*2)` square root of 25 is 5 so that can come out of root, 2 stays in

=5√2