In trapezoid abcd, find m∠a if m∠b= 25°, m∠c = 155° and m∠ d= 117°. a) 25° b) 63° c) 73° d) 92°

We know that a trapezoid is a quadrilateral and we also know that the sum of the four interior angles of a quadrilateral always equals .

Now, it is given that 3 interior angles of a trapezoid are m∠B= 25°, m∠C = 155° and m∠ D= 117°. The sum of these three angles is:

25°+155° +117°=

Thus, the measure of the fourth interior angle, will be:

=

Thus, out of the given options, Option B is the correct one.

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