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mem8163
14.06.2021 •
Mathematics
I need help pleaseeee
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Ответ:
A. 70°
Step-by-step explanation:
There are two ways to solve this problem:
(1) The sum of all the angles of a quadrilateral equals 360°.
The equation for this problem would be:
110° + 110° + 70° + m∠A = 360°
Simplify:
290° + m∠A = 360°
m∠A = 70°
(2) Trapezoid ABCD is an isosceles trapezoid, because m∠B and m∠C, opposite angles of the same base of the trapezoid are congruent.
Therefore m∠A and m∠D must also be congruent.
m∠A = m∠D = 70°
Ответ: