md`# Euclid’s proof of Pythagoras’s Theorem
`
cy = 5
{
const ct = canvas.ct;
ct.save();
ct.clearRect(0, 0, WIDTH, HEIGHT);
ct.transform(1, 0, 0, -1, 0, HEIGHT);
const L = a * sin;
ct.beginPath();
ct.moveTo(L, c + 10);
ct.lineTo(c + L, c + 10);
ct.lineTo(L + a * cos, c + 10 + a * sin);
ct.closePath();
ct.lineWidth = 0.5;
ct.strokeStyle = "#999";
ct.stroke();
// ct.beginPath();
// ct.moveTo(L, 10);
// ct.lineTo(c + L, 10);
// ct.lineTo(c + L, c + 10);
// ct.lineTo(L, c + 10);
// ct.lineTo(L, 10);
// ct.lineWidth = 1;
// ct.strokeStyle = "#999";
// ct.stroke();
ct.save();
ct.translate(L, c + 10);
ct.rotate(-Math.PI/2 * t[1]);
ct.beginPath();
ct.moveTo(0, 0);
ct.lineTo(a * cos + t[0] * b * sin, a * sin - t[0] * b * cos);
ct.lineTo(a * (cos + sin * (t[2] - 1)) + t[0] * b * sin, a * (sin + cos) - t[0] * b * cos);
ct.lineTo(a * sin * (t[2] - 1), a * cos);
ct.closePath();
ct.fillStyle = "rgba(255,244,0,0.5)";
ct.fill();
ct.restore();
ct.save();
ct.translate(L + c, c + 10);
ct.rotate(Math.PI/2 * t[4]);
ct.beginPath();
ct.moveTo(0, 0);
ct.lineTo(a * cos * (1 - t[3]) - c, a * sin * (1 - t[3]));
ct.lineTo(a * cos * (1 - t[3]) + b * cos * (1 - t[5]) - c, a * sin * (1 - t[3]) + b * sin);
ct.lineTo(b * cos * (1 - t[5]), b * sin);
ct.closePath();
ct.fillStyle = "rgba(0,0,255,0.3)";
ct.fill();
ct.restore();
ct.restore();
return this || html`(<i>the drawing function</i>)`;
}
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