One of the base angles of an isosceles triangle is 70°. The vertical angle is
(a) 35°
(b) 40°
(c) 70°
(d) 80°

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Solution

(b) 40°

Since one base angle is 70°, the other base angle will also be 70° because the triangle is isosceles.
Vertical angle:
180 − 70 − 70 = 40 $°$ (angle sum property of a triangle)

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