Generated by SassMeister.com.

SassMeister-input.scss

// ----
// Sass (v3.4.7)
// Compass (v1.0.1)
// ----

$pi: 3.14159265359;
@function pow($base,$exp){
	$value: $base;
	@if $exp > 1{
		@for $i from 2 through $exp{
			$value: $value * $base;
		}
	}
	@if $exp < 1{
		@for $i from 0 through -$exp{
			$value: $value / $base;
		}
	}
	@return $value;
}
@function fact($val){
	$value: 1;
	@if $val > 0{
		@for $i from 1 through $val{
			$value: $value * $i;
		}
	}
	@return $value;
}
@function sin($angle, $degrees: false){
	$sin: 0;
	@if $degrees{
		$angle: $angle / 180 * $pi;
	}
	@for $n from 1 through 10{
		$sin: $sin + ( pow(-1,$n) / fact(2*$n+1) ) * pow($angle,(2*$n+1));
	}
	@return $sin;
}
@function cos($angle, $degrees: false){
	$cos: 0;
	@if $degrees{
		$angle: $angle / 180 * $pi;
	}
	@for $n from 1 through 10{
		$cos: $cos + ( pow(-1,$n) / fact(2*$n) ) * pow($angle,2*$n);
	}
	@return $cos;
}
@function tan($angle, $degrees: false){
	@if $degrees{
		$angle: $angle / 180 * $pi;
	}
	$tan: sin($angle) / cos($angle);
	@return $tan;
}

$width: 100px;
$height: 300px;
$top-height: 70px;
$bottom-height: $height - $top-height;
$angle: 10;

$x: ( -$height - $top-height ) / (tan($angle) + ($top-height / $width));
$y: ($height / $width) * $x - $height;

.Foo {
  x: $x;
  y: $y;
  t: tan($angle, true);
}

SassMeister-output.css

.Foo {
  x: 640.21744px;
  y: 1620.65231px;
  t: 0.05824;
}