It's been a while, so take my response with a grain of salt. I think that:
1. Setting up the equation
tan(20) = 10 / A
2. Multiply both sides by denominator:
A*tan(20) = 10
3. Divide both sides by tan(20):
A = 10 / tan(20)
4. Simplified:
A = 4.46995109
Eh? We got different answers? Well ignore mine, I haven't taken calculus in forever.
|