Exercises: Sine and Cosine of Complementary Angles

Grade 9·20 problems·~28 min·Common Core Math - HS Geometry·standard·hsg-srt-c-7

Work through problems with immediate feedback

Warm-Up

In a right triangle with acute angles $\alpha$ and $\beta$ , which statement must be true?

$\alpha = \beta$

$\alpha + \beta = 180\degree$

$\alpha + \beta = 90\degree$

$\alpha + \beta = 45\degree$