## 1- Rates and Proportions: A Lost Beach

Determine the rate of coastal erosion by estimating changes in historical aerial photos.

These geometry and beginning algebra activities highlight the critical linkages between math and maps, using ArcGIS Online to extend core concepts. Activities address distances, areas, volumes, irregular shapes, linear modeling, minimum path, triangulation, and more. For more GeoInquiry resources, see the Guide "Getting to Know GeoInquiries". For different subjects, see the "GeoInquiries Collections".

Fifteen-minute activities that teach standards-based content without a login to or installation of ArcGIS Online

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