Question

if three angles of a quadrilateral are 120 degree 130 and 10 degree then what is the fourth angle

Answer 1

Let the given quadrilateral be ABCD.

Given:

<A=120°

<B= 130°

<C=10°

To Find:

<D (Fourth angle)=?

Solution:

Since, We know that,

Sum of all angles of a quadrilateral=360°.

Therefore,

<A+<B+<C+<D=360°

120°+130°+10°+<D=360°

<D+260°=360°

<D=360°-260°

<D=100°

So, The fourth angel of a quadrilateral is 100°.

Answer 2

Step-by-step explanation:

1st angle = 120°

2nd angle =130°

3rd angle=10°

let,

fourth angle be x

We know that sum of all four angle of quadrilateral is 360°

then,

120+130+10+ x = 360°

260+ x = 360°

x =360-260

=100

hence

the fourth angle i.e x is 100

answer