Question

Tolong yaa sama caranya jugaa,makasih:))

Answer 1

Verified answer

Kelas 7 Matematika
Bab 4 - SPLSV

Diketahui:
AC = (4x - 9) cm
BD = (2x + 3) cm

Ditanya:
Luas persegi = ... cm²?

Penyelesaian:

****Cari nilai x****

AC = BD
(4x - 9) = (2x + 3)
4x - 2x = 3 + 9
2x = 12
x = 12 / 2
x = 6


****Panjang AC****

AC = 4x - 9
AC = 4 . 6 - 9
AC = 24 - 9
AC = 15 cm


****Panjang BD****

BD = 2x  + 3
BD = 2 . 6 + 3
BD = 12 + 3
BD = 15 cm


****Luas Persegi****

Sisi × Sisi
= AC × BD
= 15 cm × 15 cm
= 225 cm²

Jawaban:
225 cm²

Option ⇒ A

Semoga Membantu^-^