Cosine Ratio Calculator
📐 Trigonometry & Pythagoras. Use the Cosine ratio (CAH) formula to find adjacent, hypotenuse, angle θ: pick the value you want, type the others, and the answer updates as you go.
Adjacent8.6603 cm
Pick the ○ next to the value you want to find, fill in the others, and it solves as you type.
What each letter means
| Quantity | Unit |
|---|---|
| Adjacent | cm |
| Hypotenuse | cm |
| Angle θ | ° |
Worked example
Find the adjacent when Hypotenuse = 10 cm, Angle θ = 30 °.
Using cosθ = adjacent/hypotenuse: Adjacent = 8.6603 cm.
Frequently asked questions
What is the formula for Cosine ratio (CAH)?
cosθ = adjacent/hypotenuse.
What do the letters stand for, and what units are used?
Adjacent in cm, Hypotenuse in cm, Angle θ in °.
How do you calculate adjacent?
Put the values into cosθ = adjacent/hypotenuse. For example, with Hypotenuse = 10 cm, Angle θ = 30 °, adjacent = 8.6603 cm.
Can I solve for a different value?
Yes. In the calculator above, pick the circle next to any value (adjacent, hypotenuse, angle θ) and fill in the others: it rearranges the formula for you.
