Question

class 9th Maths lines and anglesquestion 1 2 3 and 4

Answer 1

1)...given:-2/3×90
=60

so,let another angle be x
60+x=90
x=90-60
x=30


2)...given:-4/3×90
=120

so,let another angle be x
120+x=180
x=180-120
x=60

3)Let the first angle be x
and second angle be y

so,
x+y=90.....i

and,
x=5y....ii

putting value of x in equation i
x+y=90
5y+y=90
6y=90
y=15

so,
x=5y
x=5×15
x=75

4)
=>The sum of supplementary angle is equal to 180

(3x-58)+(x+38)=180

3x-58+x+38=180

4x-20=180

4x=180-20

4x=160

x=40


@Altaf