Curriculum placement
Geometry. This describes the skill, not a learner estimate.
Sine, cosine, and tangent
Use sine cosine and tangent ratios to solve right triangles
Problem types
- Directional bearings
- Sine, cosine and tangent
- Trigonometry from a described situation
- Leg of a right triangle from the hypotenuse and an angle in degrees
- Isosceles triangle measures from an altitude and an angle
- Choose the trigonometric ratio that uses the altitude's triangle
- Height from an angle of elevation and an angle of depression
- Show the work: a leg of a right triangle from the hypotenuse and an angle
- Show the work: height from angles of elevation and depression
- Show the work: perimeter of an isosceles triangle from the apex angle and altitude
Builds on
Leads to
- Sine and cosine of complementary angles
- Side ratios of special right triangles
- The laws of sines and cosines
- Area from two sides and the included angle
- Vectors and their components
- Exact values at special angles · Extend the idea
Right-triangle ratios of 30°, 45° and 60° become the unit-circle coordinates, and the quadrant sign extends them to every angle.
Related skills
- Why every circle is similar to every other · Shared foundations
- Distance in the coordinate plane · Shared foundations
- Theorems about similar triangles · Shared foundations
Open the interactive map to explore lessons and skill connections.