Question

the set of all triangĺes in plane having sum of there three angles less than 180​

Answer 1

Answer:

Step-by-step explanation:

f A is the set of all triangles defined in a plane whose sum of measures of all angles is less than 180 degrees, then,

Because, any triangle defined in a plane has a sum of all angles to be exactly equal to 180 degrees.

Answer 2

Answer:

it is an empty set

Set = {}

Step-by-step explanation:

Having sum of all angles of a triangle equal to 180 is a fundamental property, you can not orient 3 line to form a closed fig without satisfying the above property.

Hence, it's is an empty set