Confusion Concerning Numerical Equation

[Avery Stupidman]

Hello,

I have a function "angle" that returns the angle (in degrees) of 
a right triangle given the length of the its lengths as type 
"real". It works, but when trying to test the equality of the 
angle with the seemingly identical value, I'm informed that the 
two are not equal. Thus, when angleDeg(sqrt(3.0)/2.0, 1.5) 
returns 60, the comparison "angleDeg(sqrt(3.0)/2.0, 1.5) == 60" 
resolves to false.

I'm most likely stupid and sleep deprived, but if I may have some 
elucidation, I'd be very grateful.

Some code:

real angleDeg(real x, real y)
{
	import std.math : PI, abs, atan2, sgn;

	auto angle = atan2(y, x);
	
	// Simplify angle if vector resides in quadrants II or III
	if (x < 0)
	{
		angle = (PI - abs(angle)) * sgn(angle);
	}

	return angle * 180 / PI;
}

import std.math : sqrt;

assert(angleDeg(sqrt(3.0)/2.0, 1.5) == 60.0); // Fails