CK-12 Foundation
Ck 12: Trigonometry: Distance Between Two Polar Coordinates
[Free Registration/Login may be required to access all resource tools.] Find the distance between two points expressed in polar coordinates.
Varsity Tutors
Varsity Tutors: Web English Teacher: Chris Van Allsburg Lesson Plans
Explore the informative links found within this site to gain an insight into the life and work of Chris Van Allsburg. This site provides lesson plans, teaching ideas and activities for several of his works.
Houghton Mifflin Harcourt
Chris Van Allsburg: Houghton Mifflin Books
Provides a brief biography, a bibliography with synopses, the text of his two Caldecott Medal acceptance speeches, and three audio samples of Vans Allsburg's works.
TES Global
Blendspace: Author Study Chris Van Allsburg
A learning module with eleven links to information, websites, pictures, and videos about award-winning author Chris Van Allsburg.
Curated OER
Ed Tech Clearinghouse: Koppen Climate Classification of North America, 1911
A map from 1911 of the climate regions of North America using the classification system developed by Wladimir Koppen, based on the concept that native vegetation is the best expression of climate. The major groups are (A)...
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