G-SRT.C. Define trigonometric ratios and solve problems involving right triangles

• Finding the Area of an Equilateral Triangle
• Mt. Whitney to Death Valley
• Seven Circles I

G-SRT.C.6. Understand that by similarity, side ratios in right triangles are properties of the angles in the triangle, leading to definitions of trigonometric ratios for acute angles.

• Defining Trigonometric Ratios
• Tangent of Acute Angles

G-SRT.C.7. Explain and use the relationship between the sine and cosine of complementary angles.

• Sine and Cosine of Complementary Angles
• Trigonometric Function Values

G-SRT.C.8. Use trigonometric ratios and the Pythagorean Theorem to solve right triangles in applied problems.

• Ask the Pilot
• Coins in a circular pattern
• Constructing Special Angles
• Neglecting the Curvature of the Earth
• Setting Up Sprinklers
• Seven Circles III
• Shortest line segment from a point $P$ to a line $L$