If the base angle of an isosceles triangle is 40°, what is the measure of its vertex angle?

1 Answer
Jim G.
Apr 21, 2018

#100^@#

Explanation:

#"the sum of the angles in a triangle "=180^@#

#"the 2 base angles in an isosceles triangle are equal"#

#"subtracting the sum of the base angles from 180 gives"#
#"the vertex angle"#

#rArr"vertex angle "=180-(40+40)=100^@#

Related questions
Impact of this question
7300 views around the world
You can reuse this answer
Creative Commons License