Final answer:
To determine the length of side o'p' post-dilation, multiply the original length of side op by the scale factor of 3/4.
Step-by-step explanation:
To find the measure of side o'p' after triangle opq is dilated by a scale factor of 3/4, we simply multiply the original length of side op by the scale factor. If the original length of side op is known, apply the scaling as follows: original length of op × (3/4) = length of o'p'. Without the actual measurement of op, we cannot determine the numerical value of o'p', but the process is the same.