Question

Two angles of a triangle is 40° and 30°, find the third angle of triangle

Answer 1

Hey !!
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Here is your answer
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Let the third angle be x

Then !

x + 40° + 30° = 180° ( As we know that the sum of angles of a triangle is 180°)

so!!

x = 180° - 70°
x = 110°

Hence the third angle is 110°
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x

Answer 2

sum of angles of a triangle =180 ( angle sum property of a triangle )
let third angle be x
40+30+x=180
70+x=180
x=180-70=110

third angle is 110