sin of one angle = cos of the other Quiz
10 questions · easy to harder · Geometry · score and step-by-step answers
How it works
- 10 questions, about 20 minutes (a timer counts down; you can hide it). Solve it right here: no sign-up.
- 4 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.
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1 Question 1
sin 30° = cos x°, find x- A) x = 90
- B) x = 60
- C) x = 30
2 Question 2
cos 25° = sin k°, find kType the answer.
3 Question 3
sin x° = cos 50°, find x- A) x = 40
- B) x = 50
- C) x = 90
4 Question 4
cos 45° = sin x°, find xType the answer.
5 Question 5
A and B are the small angles of a right triangle, sin A = 45, find cos BType the answer.
6 Question 6
Triangle PQR, angle R = 90°, cos P = 513, find sin QType the answer.
7 Question 7
Solve sin x° = cos(x + 30)°- A) x = 60
- B) x = 90
- C) x = 30
- D) x = 0
8 Question 8
Solve cos k° = sin(k − 20)°Type the answer.
9 Question 9
Solve cos(3x)° = sin(x + 14)°- A) x = 7
- B) x = 90
- C) x = 19
- D) x = 76
10 Question 10
Solve sin(5x + 4)° = cos(3x − 2)°Type the answer.