Question

Panjang diagonal" suatu belah ketupat dik berturut" 18 cm dan (2x+3) cm. Jika luas belah ketupat tersebut 81 cm² tentukan:
a. nilai x
b. panjang diagonal yang kedua

Answer 1

Luas = 1/2 . d1 . d2
<=> 81 = 1/2 . 18 . (2x + 3)
<=> 81 = 9(2x + 3)
<=> 2x + 3 = 81/9
<=> 2x + 3 = 9
<=> 2x = 9 - 3
<=> 2x = 6
<=> x = 6/2
<=> x = 3

a. x = 3
b. Diagonal kedua = 2(3) + 3 = 9 cm

Answer 2

Luas = 1/2 . d1 . d2
<=> 81 = 1/2 . 18 . (2x + 3)
<=> 81 = 9(2x + 3)
<=> 2x + 3 = 81/9
<=> 2x + 3 = 9
<=> 2x = 9 - 3
<=> 2x = 6
<=> x = 6/2
<=> x = 3

a. x = 3
b. Diagonal kedua = 2(3) + 3 = 9 cm

Semoga membantu :)