Question

Do as directed.

1. The measure of three angles of a quadrilateral is 30˚, 70˚ and 100˚. Find out

the measurement of fourth angle.

(1)

2. The measurement of one side of an equilateral quadrilateral is 10 cm. What is

the perimeter of the quadrilateral?

(1)

3. The perimeter of a square is 100 cm. What will be the measurement of each

of its side?

(1)

4. Parallelogram ‘BEST’ is given below. Find the measurement of angle x and

angle y.

​

Answer 1

Answer:

2nd is correct☑

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Answer 2

Answer:1.160

2.40

3.25

4.x=100,y=100

Step-by-step explanation:

.A1. Sides of the quadrilateral:- <A=30,<B=70,<C=100,<D=?

The sum of all the angles is 360

So <D = 360-(<A+<B+<C)

:.<D=360-(30+70+100)

:.<D=360-(100+100)

:.<D=360-200

:.<D=160

A2.As the quadrilateral is equilateral all the sides measure the same,

That is 10 cm

P=4(l)

P=4(10cm)

P=4x10cm

P=40cm

A3.Perimeter of the square=100cm

Length of the square =?

P=4(l)

:.100=4(l)

100/4=l

25=l

A4.As ‘BEST’ is a parallelogram so ,<T = <E which is <X

:.<X=100

In the same way <B=<S , for finding <Y we have to find <S first

180= <E+<S

180=100+<S

180-100=<S

80=<S

So now we will find <Y

<Y+<S=180

<Y+80=180

<Y=180-80=100