http://www.ck12.org Chapter 8. Right Triangle Trigonometry
tan 45◦=15
BC
sin 45◦=15
AC
BC=
15
tan 45◦= 15 AC=
15
sin 45◦≈ 21. 21
45-45-90TriangleRatios
BC=AB= 15 ,AC= 15
√
2 ≈ 21. 21
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