Question

find the sum of angle 1 to 9

Answer 1

hey mate.....
we know that sum of all interior angles of a triangle is 180°
so...
in triangle ABC
1+2+3 = 180° --------1equation
in triangle ACD
6+4+5 = 180° --------2equation
in triangle ADE
7+8+9 = 180° ---------3equation

now adding equation 1, 2 and 3
1+2+3+4+5+6+7+8+9 = 180+180+180
1+2+3+4+5+6+7+8+9 = 540°

HOPE THIS HELP YOU ☺☺

Answer 2

We know sum of angles of a triangle is 180degree

angles(1+2+3)=180degree........(1)

angles(4+5+6)=180degree........(2)

angles(7+8+9)=180degree........(3)

Adding 1,2 and 3

angles(1+2+3+4+5+6+7+8+9)=180+180+180

=540degree

Hey this is the answer.