Exercise 01
Find the third angle.
Triangle ABC with ∠A = 47° and ∠B = 62°.
Exercises
Practice set
Six short problems covering angle sum, Pythagoras, primary ratios, the law of sines, the law of cosines, and Heron. Attempt each before opening the working.
Exercise 02
Find the hypotenuse.
Right triangle with legs 9 and 12. Right angle between the legs.
Exercise 03
Find sin θ, cos θ, and tan θ.
Right triangle. Opposite to θ is 5, adjacent is 12, hypotenuse is 13.
Exercise 04
Find side a.
∠A = 40°, ∠B = 73°, b = 18. (ASA / AAS setup.)
Exercise 05
Find side c.
a = 8, b = 11, included ∠C = 34°.
Exercise 06
Find the area.
Sides 7, 15, 20.