A) First option
Opposite - 2
Hypotenuse - a
OH - SOH
SIn(45) = 2/h
x h, then ÷ sin45
h = 2/sin45
h= 2 root 2
=2.83 to 2d.p
Or
Use Pythagoras Theorem to find a because b=2 as we're shown an isosceles triangle with those little dashes, on two side lengths.
Hope this helps!
