Question

in parallelogram ABCD , angleA =3 times angle B.Find all the angles of the parallelogram.In the same parallelogram , if AB= 5x - 7 and CD = 3x + 1; find the length of CD.

Answer 1

let angle B=x. Therefore angle A=3x.  Angle A + angle B=180.{ co-interior angles}. 

x+3x=180.

4x=180

x=180/4

x=45

Angle A=x=45

Angke B=3x=3*45=135

Angle C=Angle A=45 {opposite angles of a //gm are equal}

Angle D=Angle B=135

AB=CD {OPPOSITE SIDES OF  A //gm are EQUAL}

5x-7=3x+1

5x-3x=1+7

2x=8

x=8/2

x=4

CD=3x+1=3*4+1=12+1=13

Answer 2

Answer:

that's the answer

Step-by-step explanation:

CD=13