I will give brainlest please help

BC = 10 m ; CA = 5√3 m

Step-by-step explanation:

A right triangle with an angle of 60 degrees is half of a equalteral one

BC (the hypotnuese) is double the minor length (BA)

BC = 10 m

CA (the height) can be expressed as the minor leg multiply by √3

CA = 5√3 m

last option

step-by-step explanation:

given that δdef is right and isoceles,

assuming that side df is the hypotenuse means that de an ef are the other 2 sides that intersect at 90° and are of equal length.

because they are of equal length, we can say that they are congruent

because they intersect at 90°, their slopes must be opposite reciprocals.

only the last option satisfies these conditions.

b i think

step-by-step explanation:

not really sure