### 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, read the Getting to Know GeoInquiries guide; for different subjects, explore GeoInquiries collections.

The classic GeoInquiries will be retiring in the coming months. Please explore the new GeoInquiries for Map Viewer.

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

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