Question

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Answer 1

you can search on google to get the best answer for this question

Answer 2

Answer:

2,3,4,8 are in picture

Step-by-step explanation:

9) x+y = 180°.----------1

x:y=5:4.

x/y = 5/4

x=5/4( y). ------------2

substitute x value in 1

u get

5/4(y) + y =180°

take L.C.M u get

(5y+4y)/4 = 180°

9y = 180° × 4

9y = 720°

y = 80°

x = 180 - 80 = 100°

10). say angle AOD as X and Angle COD as Y

and Angle BOC as Z

then

X+Y+Z. = 180°

X+Y. = 180° - Z. ------1

X:Y = 5:2

X/Y. =. 5/2

X= 5/2 Y. --------2

SUBSTITUTE 2 IN 1

5/2Y + Y = 180° - Z

7Y/2 = 180° - 40°. SINCE Z = 40°

Y = 140 × 2 /7

Y= 40°. angle COD

X+Y =140°

X = 140 - Y

X = 140 - 40

X = 100° I.e angle AOD

11). Take x= angle AOP = 30

y= angle COP =?

z = angle COQ = ?

a = angle BOQ = 50°

COP : COQ = 2 : 3

y : z = 2 : 3

y/z. = 2/3

y. = 2/3 z. ----------1

x+y+z+a = 180°

30+ y + z + 50 = 180

80 + y + z = 180

y + z = 180 - 80

y+ z = 100 -----------2

substitute 1 in 2

( 2/3) z + z. = 100

5z/3 = 100

5z = 300

z. = 60°

y = 100 - 60

y = 40° .