Lesson #1: Area of Circles

Obtuse triangle: If , then it is an obtuse triangle. Special right triangles: 30-60-90, 45-45-90. 30-60-90: Hypotenuse is twice the short leg, long leg is times the short leg. 45-45-90: Hypotenuse is times each leg. Trigonometry: used to find the lengths of sides in a right triangle when Pythagorean thm. or special triangles won’t work. ................
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