Question

1. if three angles of a quadrilateral are 30degree ,120degree,80degree then the fourth angle is​

Answer 1

Answer:

Fourth angle of quadrilateral=

=360-(30+120+80)

=360-230

=130

Answer 2

Given: three angles of a quadrilateral are 30 degree ,120 degree,80 degree

To find: fourth angle

Step-by-step explanation:

Quadrilateral: A quadrilateral with each pair of opposite sides are parallel, it has four sides ,it is 2D figure, whose sum of internal angles is $360^o$.

Such types of a quadrilateral  

1. Square
2. Rectangle  
3. Parallelogram
4. Trapezium  
5. Rhombus

According to question

The sum of all angles of a quadrilateral is $360^o$

$\angle A+\angle B+\angle C +\angle D=360$

$30+120+80+\angle D=360$

$230+\angle D=360$

$\angle D=360-230$

$\angle D=130^o$