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Name: __________________________ Algebra III – Trigonometry Guided Notes - Special Right Triangles 45-45-90 Guided Notes Construct an isosceles right triangle. Label the congruent sides and angle measures. If you know one side is x, find the other two sides. IF YOU KNOW A LEG a b 10 c a b c 60 3 2 9 30 IF YOU KNOW THE HYPOTENUSE 4 9 3 6 Name: ________________________________ 30-60-90 Triangle Guided Notes Draw and equilateral triangle with side lengths of an even number. Then draw an altitude. Redraw the right triangle, label the angles and find all 3 sides of that triangle. If you know the small leg a 7 2 5 5 b c If you know the hypotenuse a b c 16 3 11 7 If you know the big leg a b 9 7 13 22 c