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Distances — Measurement
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## Indirect Measurement and Trigonometry [electronic resource]

Learn how to use the concept of similarity to measure distance indirectly, using methods involving similar triangles, shadows, and transits. Applies basic right-angle trigonometry to present the relationships among steepness, angle of elevation, and height-to-distance ratio. Uses trigonometric ratios to solve problems involving right triangles.
Online
2002
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## Area [electronic resource]

Defines area as a measure of how much surface is covered. Explores the relationship between the size of the unit used and the resulting measurement. Finds the area of irregular shapes by counting squares or subdividing the figure into sections. Describes how to approximate the area more accurately by using smaller and smaller units. Relates this counting approach to the standard area formulas for triangles, trapezoids, and parallelograms.
Online
2002