Question

13. In an isosceles triangle, the base angle is 40° more than two times its vertical angle.
Find all the angles of the triangle.​

Answer 1

Answer:

all angles are 20°, 80° & 80°

Step-by-step explanation:

in isosceles triangle two sides are equal

so, angels opposite to equal side are also equal means,

base angles are equal

let the vertical angles be x

so, base angle= 40+2x

sum of interior angles of triangle= 180°

x+(40+2x)+(40+2x) = 180°

x+40+2x+40+2x= 180°

5x+80= 180°

5x= 180-80

x= 100/5

x= 20°

base angles= 40+2x = 40+2(20)= 40+40= 80°

Answer 2

Answer:

ur answer

Step-by-step explanation:

20°80°80°

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