Missing angle in a quadrilateral
Find the total of the interior angles, then subtract the angles you know.
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Three angles of a quadrilateral measure 138°, 84° and 118°. What is the measure of the remaining angle, in degrees?
Answer: 20
Three angles of a quadrilateral measure 79°, 70° and 191°. What is the measure of the remaining angle, in degrees?
Answer: 20
Three angles of a quadrilateral measure 143°, 49° and 148°. What is the measure of the remaining angle, in degrees?
Answer: 20
Tip: Find the total of the interior angles, then subtract the angles you know.
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