SOLUTION: In an isosceles triangle, of the ratio of the vertex angle to the base angle is 1: 4, what is the degree measure the base angle?
(a)20 (b) 30 (c) 36 (d) 40 (e) 80
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-> SOLUTION: In an isosceles triangle, of the ratio of the vertex angle to the base angle is 1: 4, what is the degree measure the base angle?
(a)20 (b) 30 (c) 36 (d) 40 (e) 80
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Question 340314: In an isosceles triangle, of the ratio of the vertex angle to the base angle is 1: 4, what is the degree measure the base angle?
(a)20 (b) 30 (c) 36 (d) 40 (e) 80 Answer by Jk22(389) (Show Source):
You can put this solution on YOUR website! v=vertex angle in °, b=base angle in °
data) v/b=1/4=>b=4v
condition) b+v+b=180 (isocele triangle has 2 same vertex angle)
=> 9v=180 => v=20
=> solution (a)
