The complicated mathematical steps in senior two are proving the problem. Look at the conditions given to you in the question. Each condition corresponds to an answer. You don't need to write the answer. Write the results only if there are conditions, because after the third grade, those complicated steps can be omitted.

Example: In triangle ABC, AB=AC, angle BAC= 120 degrees, D is a point above BC, DA is perpendicular to AB, and AD=24, so BC is found.

Solution: Because angle CAB= 120 degrees and AB=AC, angle B= angle C = 30 degrees, because AD is perpendicular to AB, angle DAC = 30 degrees, because AD = 24, CD = 24, and because angle DAB = 90 degrees and angle B = 30 degrees, BD = 24 * 2.