Four

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If AB is parallel to DC, angle ABC is equal to angle CDA, and angle BCD is equal to angle DAB, and segment AX is equal to segment XC, then ABCD is a parallelogram. True

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Special Right Triangles 30°-60°-90° and 45°-45°-90°

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Circle Theorem 9
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Integraler
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Aritmetisk
Sinus
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