cube root = a = 2 3√a 3√a 3√a 3√8 4√a 4√a 4√a fourth root = ±2 4√16 a = a n n-th root for n=3, = 2 n√8 (radical) % 1% = 1/100 10% × 30 = 3 ‰ 1‰ = 1/1000 = 0.1% 10‰ × 30 = 0.3 1ppm = 1/1000000 10ppm × 30 = 0.0003 p 1ppb = 10ppb × 30 = 3×10-7 per-billion 1/1000000000 1ppt = 10-12 10ppt × 30 = 3×10-10 per-trillion Geometry symbols Symbol Symbol Meaning / definition Example Name angle formed by two rays = 30° ∠ ∠ABC measured ABC = 30° angle
cube root 3√a 3√a 3√a = a 3√8 = 2 fourth root 4√a 4√a 4√a = a 4√16 = ±2 n-th root (radical) for n=3, n√8 = 2 % 1% = 1/100 10% × 30 = 3 ‰ 1‰ = 1/1000 = 0.1% 10‰ × 30 = 0.3 1ppm = 1/1000000 10ppm × 30 = 0.0003 per-billion 1ppb = 1/1000000000 10ppb × 30 = 3×10-7 per-trillion 1ppt = 10-12 10ppt × 30 = 3×10-10 Geometry symbols Symbol Symbol Name Meaning / definition Example ∠ angle formed by two rays ∠ABC = 30° measured angle ABC = 30° a n p
basic_math_symbols.docx