Hover or tap underlined Spanish terms to see their translation and exam tip.
Calcular la distancia ortodrómica entre el punto A (l= 30° 37,0’ N; L= 143° 38,0’ E), hasta el punto B (l= 29° 28,0’ N; L= 127° 30,0’ W).Calculate the great-circle distance from point A (l = 30° 37.0’ N, L = 143° 38.0’ E) to point B (l = 29° 28.0’ N, L = 127° 30.0’ W).
Show the answer
Correct answer: b) 4476.7 miles.
Why it is correct
Crossing the antimeridian, ΔL = 360º − (143º 38′ + 127º 30′) = 88º 52′. Applying cos D = sin l1 sin l2 + cos l1 cos l2 cos ΔL gives cos D = 0.26539, D = 74.612º, and 74.612 × 60 = 4476.7 miles.
Why the others are not
- a) Does not match the spherical triangle solution.
- c) Does not match the spherical triangle solution.
- d) Does not match the spherical triangle solution.
How to work it out in the exam
- If L1 + L2 > 180º, take ΔL = 360º − (L1 + L2).
Where this question comes from
- Ministerio de Transportes (Madrid) · 2025 · Convocatoria de noviembre · CY Test 1 · question 20 Official paper · Official answer key
- Ministerio de Transportes (Madrid) · 2025 · Convocatoria de noviembre · CY Test 2 · question 13 Official paper · Official answer key
Pending instructor review. Machine translation, not reviewed.