The law of cosines Quiz
10 questions · easy to harder · Trigonometry · score and step-by-step answers
How it works
- 10 questions, about 30 minutes (a timer counts down; you can hide it). Solve it right here: no sign-up.
- 5 questions have choices. For the others you type the answer: a number like 4, −2, 7/2 or 3.5, or for example x = 4, x = 2 or x = −3, (3, 5), 2x + 1. Use ^ for powers (x^2) and sqrt for √. Any form with the same value counts (7/2 = 3.5).
- One question at a time: Back, Next, Mark for review and the question list at the bottom. A calculator is on the screen.
- At the end: your percent and grade, every question right or wrong, why a wrong choice is wrong, and its step-by-step solution. Then practise the lesson with new questions.
Your answers and results are kept in this browser only, so you can close the page and come back.
1 Question 1
Triangle a = 5, b = 7, C = 60°, find c- A) c ≈ 6.2
- B) c ≈ 1.4
- C) c ≈ 39
- D) c ≈ 35
2 Question 2
Triangle b = 6, c = 10, A = 90°, find aType the answer.
3 Question 3
Triangle a = 8, b = 11, C = 40°, find c- A) c ≈ 50.18
- B) c ≈ 2.6
- C) c ≈ 71
- D) c ≈ 7.1
4 Question 4
Triangle b = 6, c = 9, A = 120°, find aType the answer.
5 Question 5
Triangle a = 12, c = 10, B = 35°, find b- A) b ≈ 6.9
- B) b ≈ 69
- C) b ≈ 1.8
- D) b ≈ 47.39
6 Question 6
Triangle a = 5, b = 8, C = 25°, find cType the answer.
7 Question 7
Triangle a = 5, b = 7, c = 8, find C- A) C ≈ 81.8°
- B) C ≈ 8.18°
- C) C ≈ 64°
- D) C ≈ 818°
8 Question 8
Triangle a = 6, b = 7, c = 9, find CType the answer.
9 Question 9
Triangle a = 9, b = 7, c = 5, find A- A) A ≈ 7°
- B) A ≈ 81°
- C) A ≈ 95.7°
- D) A ≈ 957°
10 Question 10
Triangle a = 8 cm, b = 6 cm, c = 5 cm, find BType the answer.