For example, say you're given the following tricky triangle:

**Take the two known sides and make a ratio (either in fraction form or colon form) of the smaller to the larger side.****Reduce this ratio to whole numbers in lowest terms.**(With a calculator, this step is a snap because many calculators have a function that reduces fractions to lowest terms.)

**Look at the fraction from Step 2 to spot the particular triangle family.**The numbers 4 and 5 are part of the 3-4-5 triangle, so you're dealing with the 3 : 4 : 5 family.

**Divide the length of a side from the given triangle by the corresponding number from the family ratio to get your multiplier (which tells you how much the basic triangle has been blown-up or shrunk).**Use the length of the hypotenuse from the given triangle (because working with a whole number is easier) and divide it by the 5 from the 3 : 4 : 5 ratio.

**Multiply the third family number (the number you don't see in the reduced fraction in Step 2) by the result from Step 4 to find the missing side of your triangle.**That's the length of side

*p*; and that's a wrap.