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There are a few ways. First, there are a multitude of trigonometric tables which list the sines and cosines of a variety of values. if you now one trigonometric value of a number, you can find all the others by hand, and you can also use a Taylor series approximation to find a fairly accurate value. (In fact, many calculators use Taylor series to find trigonometric values.)

Q: How do you find trigonometric ratios without a calculator?

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subtract 90 from it and find the trig ratio of that and it will be equal to the trig ratio that is over 90 degrees

You cannot.

Nowadays you cannot do it without a calculator.

Use a ruler

To find an angle without using a calculator, you will need to use a trig identity. Determine which angle it is and use its corresponding trig identity.

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subtract 90 from it and find the trig ratio of that and it will be equal to the trig ratio that is over 90 degrees

By themselves, they cannot. Two similar triangles have the same angels and so they have the same trig ratios. You need to know the length of at least one side to determine the area.

The trigonometric functions give ratios defined by an angle. Whenever you have an angle and a side in right triangle, you can find all the other angles and sides using the six trigonometric functions and their inverses. The link below demonstrates the relationship between functions.

It is a trigonometric equation for a right triangle, to find a non-right-angle angle. Using SOHCAHTOA, it is the opposite side divided by the adjacent angle

You cannot.

Nowadays you cannot do it without a calculator.

Use a ruler

250(how about use the calculator on your computer next time if you can't find it out? This is like baby stuff, easy without a calculator!)

The calculator will simplify the ratio A : B if possible. Otherwise the calculator finds an equivalent ratio by multiplying each of A and B by 2 to create values for C and D. Compare Ratios and Solve for the Missing Value: Enter A, B and C to find D.

Find a calculator or use your brain! And without a decimal, no.

To find an angle without using a calculator, you will need to use a trig identity. Determine which angle it is and use its corresponding trig identity.

Trigonometric identities involve certain functions of one or more angles. These identities are useful whenever expressions involving trigonometric functions need to be simplified.