Distance between Perth, Australia and Riverside, Ohio, USA
18041 km = 11210 miles
We assume a spherical Earth as a close approximation of the true shape of the Earth (an oblate spheroid). The distance is calculated as great-circle or orthodromic distance between city centres on the surface of a sphere.
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Perth, Australia
Country: AustraliaPerth’s coordinates: 31°57′08″ S, 115°51′41″ E
Population: 1,896,548
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Wikipedia article: Perth
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Riverside, USA
Country: USAState: Ohio
Riverside’s coordinates: 39°46′47″ N, 84°07′26″ W
Population: 25,201
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Wikipedia article: Riverside
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