Proof:A right angle is an angle whose degree measure is 90.Therefore, mABC. is 90 and mDEF is 90.Since mABC and mDEF are both equal to the same. quantity,they are equal to each other.Since ABC and DEF have equal mea-. sures, they are congruent. If two angles are right angles, then they are congruent.
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However, Mother's Day is now one of the most commercially successful American occasions, having become the most popular day of the year to dine out at a restaurant in the United States and generating a significant portion of the U.S. jewelry industry's annual revenue, from custom gifts like mother's rings.