Image caption, First work out the area of the triangular faces. The area of a triangle is ½ × base × height. There are two congruent (identical) triangles, so 2 × ½ × base × height = base ...

A mysterious triangular tower has been discovered at the secretive Area 51 — and social media ... the highly classified United States Air Force base has reportedly been in place for two decades ...

Photographed by Google Earth satellite images, the triangular formation ... Given what is already known about Area 51's status as an experimental aviation base for secret military R&D work ...

A strange triangular structure recently spotted on Google Earth within the secretive Area 51 military base in Nevada has sparked intense speculation and reignited alien conspiracy theories online.

A triangular structure inside Area 51 has caught public attention ... Area 51 has long been a source of conspiracy theories. The base is linked to UFO sightings and government secrets.