Question

Plz solve 11 12 13 questions

Answer 1

in Q11.all angles are equal
so ,3x=180
x=180/3

x=60
in Q12.y=80 (vertically opposite angles)
y+x+50=180
x=180-(80+50)
=180-130=50


inQ13.,x=50( corresponding angles)
x+y=127(exterior angle of a triangle is the sum of two interior angles)
y=127-50=77

Answer 2

q11
since it is an equilateral traiangle
$3x = 180 \\ x = 60$
q12
$y = 80 \: \: \: \: \: since \: it \: i s \: vertically \: opp \: angles$
x=
y+50+x=180
80+50+x=180
x=50
q13
50 +y=127. alternate angles
y=77

x=
x+y+53=180. linear pair
x+77+53=180
x=50