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Daily puzzle · 2026-10-21 · Coordinate Geometry

Mathbound Daily Puzzle — 2026-10-21 — Coordinate Geometry Solution

Level 3

Lattice points strictly inside the right triangle with vertices (0,0)(0,0), (7,0)(7,0), (0,14)(0,14)?
  1. A.39
  2. B.38
  3. C.40
  4. D.21
  5. E.49

Answer: A

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

Set it up: Formula.

Solution: 3939.

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Mathbound Daily Puzzle — 2026-10-21 — Coordinate Geometry Solution