Answer:
2
Step-by-step explanatio: look at the chart
Not A because regular means all sides are equal.
B has to be the answer because the others are not.
Not C because a right triangle is not regular, i.e. and equilateral triangle.
Not D because a rectangle has different side lengths.
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80 degrees would be your answer
Easy, they both add up to 180 degrees.
2a-9+5a+14=180
7a+5=180
7a=175
a=25
