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Daily puzzle · 2026-11-06 · Coordinate Geometry

Mathbound Daily Puzzle — 2026-11-06 — Coordinate Geometry Solution

Level 3

Lattice points strictly inside the right triangle with vertices (0,0)(0,0), (13,0)(13,0), (0,11)(0,11)?
  1. A.24
  2. B.71.5
  3. C.60
  4. D.59
  5. E.61

Answer: C

Key idea: (A−1)(B−1)2\frac{(A-1)(B-1)}{2} for this triangle.

Set it up: Formula.

Solution: 6060.

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Mathbound Daily Puzzle — 2026-11-06 — Coordinate Geometry Solution