Pythagorean Identity and Basic Trig Identities

Grade 10·20 problems·~30 min·ACT Math·topic·act-geo-trig-pythagid

Work through problems with immediate feedback

Recall / Warm-Up

$Unit circle with left half (Q2 and Q3) in red labeled cos θ < 0, and right half (Q1 and Q4) in teal labeled cos θ > 0.$

In which quadrants is cosine negative?

Quadrants I and II

Quadrants II and III

Quadrants III and IV

Quadrants I and IV