The diagram shows a circle with center o. chords ac and bc are drawn such that mab and mcd are 42 degrees and 68 degrees, respectively. what is m angle dec?

The measure of angle DEC is 1/2 times the sum of the 2 arcs. The arcs measure 110 degrees, so the angle DEC is half of that at 55 degrees.

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step-by-step explanation:

for this case we must apply distributive property to the following expression:

the distributive property states that:

then, when applying the property we have to multiply the -2 for each term within the parenthesis: