1st problem:
A = 630 cm
2nd problem:
A = 104 cm
All I can see on the picture you provided.
Pythagorean theorem is

and using that sin is opposite/hypotenuse, you can find the third side of the triangle.

now you know adjacent is 60, so cos=60/61
600,000,000+40,000,000+400,000+9,000+200+10