Question

according to my book ans is 40°,
solution plz...:)​

Answer 1

Kite the two adjacent sides are equal

as

CB = AB

9x - 12 = 3x + 6

9x - 3x = 6 + 12

6x = 18

x = 3cm

CB = AB

9(3) - 12 = 3(3) + 6

27 - 12 = 9 + 6

15 = 15

so the perimeter of kite

AB + BC + CD + AD

= 15 + 15 + 5 +5

= 30 + 10

= 40cm

Hey, your book is correct .