In triangle ABC, DE is parallel to AC. Side AD measures 3.9 units, side DB measures 7.7 units, and DE measures?
In triangle ABC, DE is parallel to AC. Side AD measures 3.9 units, side DB measures 7.7 units, and DE measures 4.3 units. What is the measure of AC?
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Triangle DBE is similar to triangle ABC, therefore the sides have a common ratio.
Therefore AC / DE = AB / DB
AC / 4.3 = 11.6 / 7.7
AC = 4.3 * 11.6 / 7.7 = 6.48
How can DE be in triangle ABC ? there is no E in ABC.
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