Add 'Základy počítania uhlov 1' handout (Slovak) with figures

data/handouts/Images/angles-90-60-30.asy

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+import _common;
+
+real a = 55;
+pair B = (0, 0);
+pair A = (a, 0);
+pair Bp = (2 * a, 0);
+pair C = (a, a * sqrt(3));
+
+AngleMark(A, B, C, LightBlue);
+RightAngleMark(B, A, C);
+
+Draw(B, A);
+Draw(B, C);
+Draw(C, A);
+Draw(A, Bp);
+Draw(Bp, C);
+
+LabeledDot(B, "B", SW);
+LabeledDot(C, "C", N);
+LabeledDot(Bp, "B'", SE);
+LabeledDot(A, "A", S);
+
+EdgeLabel(B, C, "2a", W, distanceOffset = 8);
+EdgeLabel(C, Bp, "2a", E, distanceOffset = 8);
+EdgeLabel(B, A, "a", S, distanceOffset = 8);
+EdgeLabel(A, Bp, "a", S, distanceOffset = 8);

data/handouts/Images/angles-Ssa-proof-isosceles.asy

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+import _common;
+
+// Isosceles BCA with |CB| = |CA| = base; angle ABC = alpha. Apex angle at C
+// equals 180 − 2α, so from C (with B at direction 180°) point A sits at
+// direction 2α (CCW from +x).
+real base = 50, alpha = 40, farExtra = 35;
+pair B = (0, 0);
+pair C = (base, 0);
+real swingR = base;
+pair A = Polar(C, 2 * alpha, swingR);
+pair Bfar = ExtendPast(B, A, farExtra);
+
+AngleMark(C, B, A, LightRed, "\beta", labelPen = Red);
+
+Circle(C, swingR, Red);
+Draw(B, C, Blue);
+Draw(C, A, Red);
+Draw(B, Bfar);
+
+LabeledDot(B, "B", SW);
+LabeledDot(C, "C", SE);
+LabeledDot(A, "A", N, Red);
+
+EdgeLabel(B, C, "a", S, color = Blue);
+EdgeLabel(C, A, "b", E, color = Red);