devonaimee67
devonaimee67 devonaimee67
  • 18-06-2020
  • Mathematics
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HELP?! ASAP PLEASE! !!!

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snog
snog snog
  • 18-06-2020

Answer:

In an isosceles triangle the base angles are congruent, meaning that the "missing" angle is also a. This means that 40 + a + a = 180 because the sum of angles in a triangle is 180.

40 + a + a = 180

40 + 2a = 180

2a = 140

a = 70°

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