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Describing Angles

Describing Angles 1.10 - Solution

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The notation mBDCm\angle BDC refers to the measure of the angle in BDC\triangle BDC at vertex D.D.

Recall that congruent angles have the same number of arcs. We see in the diagram that BDC\angle{BDC} is congruent to AED,\angle AED, whose measure is 33.33^\circ. If two angles are congruent, then they have the same measure. Therefore, mBDCm\angle BDC == 33.33^\circ.