Beyond the answers - interesting background to this quiz

A border that shapes two nations

The United States shares its southern border with Mexico, a line that runs roughly 3,145 kilometres from the Pacific Ocean to the Gulf of Mexico. It is one of the busiest international boundaries in the world, crossing deserts, rivers and major cities such as Tijuana and El Paso. The border also separates very different histories: Mexico gained independence from Spain in 1821, while the United States declared independence in 1776.

The dirham and Morocco's currency

Morocco uses the dirham, a currency whose name has deep roots around the Mediterranean. The word comes from the Greek "drachma", which referred to a unit of weight and later a coin. Several countries in the region use currencies with similar names, including the United Arab Emirates and Libya, though each currency is separate and has its own value.

The Seychelles and its capital

Victoria is the capital of the Seychelles, an island nation in the Indian Ocean made up of around 115 islands. Victoria is one of the smallest capital cities in the world by population, yet it serves as the country's economic and cultural centre. The Seychelles gained independence from Britain in 1976 and remains a member of the Commonwealth.

Why triangles always add up to 180 degrees

In Euclidean geometry, the three interior angles of any triangle always sum to 180 degrees. This rule holds whether the triangle is equilateral, isosceles or scalene. It is one of the first geometric facts students learn, and it underpins much of trigonometry and construction work.

Venezuela and its neighbours

Venezuela borders three countries: Colombia to the west, Brazil to the south, and Guyana to the east. Its Caribbean coastline stretches for hundreds of kilometres and includes famous beaches and islands such as Margarita Island. The country's location at the northern edge of South America has made it a crossroads of trade, culture and migration.