{"results":"
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Handout
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\n\"Ck\n\n
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\nCK-12 Foundation\n
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\nCk 12: Geometry: Arcs and Angles Study Guide\n

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\n\nFor Students\n\n9th - 10th\n\nStandards\n
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\nThis study guide on arcs and angles covers key vocabulary, arc measurement in degrees and radians, congruent arcs, bisecting arcs, and the angles on, inside, and outside a circle. Also covers formulas and theorems. It is available for...\n
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\n\nGet Free Access\n\nSee Review\n
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Handout
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\n\"Math\n\n
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\nMath Open Reference\n
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\nMath Open Reference: Central Angle\n

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\n\nFor Students\n\n9th - 10th\n\nStandards\n
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\nA handy reference guide to central angles. It provides definitions, examples, and an interactive activity that enhances further explanation. Includes links to related topics.\n
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\n\nGet Free Access\n\nSee Review\n
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Instructional Video
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\n\"Khan\n\n
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\nKhan Academy\n
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\nKhan Academy: Perpendicular Bisectors: Area Circumradius Formula Proof\n

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\n\nFor Students\n\n9th - 10th\n\nStandards\n
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\nProof of the formula relating the area of a triangle to its circumradius.\n
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\n\nGet Free Access\n\nSee Review\n
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Unit Plan
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\n\"Cut\n\n
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\nCut the Knot\n
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\nCut the Knot: Existence of the Orthocenter\n

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\n\nFor Students\n\n9th - 10th\n
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\nThis site defines the altitude of a triangle and gives the standard notation for altitudes of a triangle. The site then goes to list several proofs involving altitudes and orthocenters.\n
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\n\nGet Free Access\n\nSee Review\n
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Interactive
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\n\"Walter\n\n
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\nWalter Fendt\n
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\nWalter Fendt: Thales' Circle\n

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\n\nFor Students\n\n9th - 10th\n\nStandards\n
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\nA short interactive activity to prove that a triangle inscribed in a semicircle is right-angled.\n
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\n\nGet Free Access\n\nSee Review\n
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Handout
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\n\"Math\n\n
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\nMath Open Reference\n
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\nMath Open Reference: Central Angle Theorem\n

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\n\nFor Students\n\n9th - 10th\n
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\nLearn about the Central Angle Theorem with this handy reference guide. Provides a detailed definition and an interactive activity that enhances further explanation. Includes links to related topics.\n
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\n\nGet Free Access\n\nSee Review\n
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\n\"Khan\n\n
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\nKhan Academy\n
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\nKhan Academy: Inscribed Shapes\n

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\n\nFor Students\n\n9th - 10th\n\nStandards\n
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\nFind missing angles and lengths in inscribed shapes. Students receive immediate feedback and have the opportunity to try questions repeatedly, watch a video or receive hints.\n
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\n\nGet Free Access\n\nSee Review\n
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\n\"Khan\n\n
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\nKhan Academy\n
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\nKhan Academy: Inscribed Shapes\n

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\n\nFor Students\n\n9th - 10th\n\nStandards\n
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\nFind missing angles and lengths in inscribed shapes.\n
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\n\nGet Free Access\n\nSee Review\n
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