[precalculus] find the area of this triangle:

check the picture below.

notice, by drawing the altitude from C, we end up with a 30-60-90 and a 45-45-90 triangle, thus we use the 30-60-90 and 45-45-90 rules as you see there.

Look at the picture.

In a 30-60-90 (45-45-90) triangle, you can find the measure of any of the three sides (picture 2).

The formula of the area of a triangle ABC:

substitute:

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step-by-step explanation:

sorry no step by step