Question

in figure 5.39 , if AB|| CD ,CD||EF and y:z= 3:7,find x. class 9th Maths​

Answer 1

Step-by-step explanation:

Given :-

AB|| CD ,CD||EF and y:z= 3:7

To find :-

Find the value of x ?

Solution :-

Method -1:-

Given that

AB || CD

CD || EF

=> AB || EF

and

y : z = 3:7

Let y = 3a° and z = 7a°

From the given figure

We notice that

The Vertically opposite angle of y is also equal to y

then y and z are interior angles on the same side to the transversal which are supplementary.

=> y+z = 180°

=> 3a°+7a° = 180°

=> 10a° = 180°

=> a° = 180°/10

=> a° = 18°

Therefore, a° = 18°

Now,

y = 3a° = 3(18°) = 54°

z = 7a° = 7(18°) = 126°

and

x and y are interior angles on the same side to the transversal which are supplementary.

x+y = 180°

=> x+54° = 180°

=> x = 180°-54°

=> x = 126°

Therefore , x = 54°

Answer:-

The value of x for the given problem is 54°

Used formulae:-

If two parallel lines Intersected by a transversal then

→ Vertically Opposite angles are equal.

→ Interior angles on the same side to the transversal are supplementary.

Answer 2

Answer:

Which of the following is not a storage device:

a) Memory Card

b) Random Access Memory

c) Pen Drive

d) CD-ROM

Step-by-step explanation:

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