An exterior angle at the base of an isosceles triangle is always :?

Question

a. acute
b. greater than the sum of the base angles
c. obtuse
d. equal to the sum of the base angles

Answer 1

Think about the base angles of an isosceles triangle. There are two of them and they are exactly the same. Since the sum of all three angles in a triangle is 180 degrees, then neither base angle could be more than (or equal to) 90 degrees (otherwise, you'd add them up and get 180 or more -- leaving no "degrees" left for the remaining angle). Therefore, the base angles must be acute. The exterior angle measure is just 180 degrees minus the angle measure. 180 minus a number between (but not including) 0 and 90 is always greater than 90. Therefore, the answer is:

C. Obtuse

Answer 2

C. Obtuse

Answer 3

adjoining skill "next to", indoors skill "interior" so the respond is: the interior perspective on the baseline is adjoining to the different indoors perspective. Now you math kinds restoration that answer. i'm particular there's a customary answer. stable success

Answer 4

c. obtuse