Answer:
D
Explanation:
Using sine and cosine ratios in the right triangle and the exact values
sin30° =
and cos30° =

sin30° =
=
=
=
( cross- multiply )
2AC = 10 ( divide both sides by 2 )
AC = 5
-------------------------------------------------------
cos30° =
=
=
=
( cross- multiply )
2BC = 10
( divide both sides by 2 )
BC = 5
