Question

(d)
10. One of the base angles of an isosceles triangle is 70° The vertical angle of the triangle is
(C) 60
(c) 65
Two angles of a triangle are 40 and 25 respectively. The third angle is
(b) 25
a) 35
(d) 115​

Answer 1

Answer:

let the isosceles triangle, base angles are of equal measurement,

Therefore, 50

0

each base angle sum of both base angle =50

0

+50

0

=100

sum of three angle is 180

0

Find vertical angle

sum of three angle = sum of base angle + vertical angle

180

0

=100

0

+ vertical angle

vertical angle =180

0

−100

0

=80

0