Geometry and TrigonometryEasy–MediumCosine from a sine
Geometry and Trigonometry practice question
In a right triangle, one acute angle θ has sin θ = 0.6. What is the value of cos θ?
Answer: 0.8 or .8 or 4/5
sin²θ + cos²θ = 1, so cos θ = √(1 − 0.36) = 0.8.
Common wrong answers
- If you answered 0.4
- 0.4 subtracts 0.6 from 1.
- If you answered 0.6
- 0.6 repeats the sine.
- If you answered 0.64
- 0.64 is 1 − sin²θ without the square root.
More Geometry and Trigonometry questions
- Easy–Medium
A circle has a radius of 6. What is its area? (Use A = πr².) - Easy–Medium
A right triangle has legs of length 6 and 8. What is the length of the hypotenuse? - Easy–Medium
A circle has a radius of 5. What is its circumference? (Use C = 2πr.) - Easy–Medium
What is the midpoint of the segment joining the points (2, 3) and (8, 11)? - Easy–Medium
What is the measure, in degrees, of angle B? - Easy–Medium
What is the area, in square centimeters, of the trapezoid?
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