a) 110°
b) 115°
c) 175°
d) 145°
The correct answer is D. 145 degrees.
The mandibular or gonial angle during perinatal period ranges from 135° to 150°; however, soon after birth, it decreases to 130° to 140°. In adult mandible, the gonial angle measures between 110° to 120°. Studies have also indicated that the angle value of females is 3-5° greater than that of males.
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