diketahui diagonal - diagonal layang - layang memiliki perbandingan 4 : 5 . jika luas layang - layang 90 cm maka panjang masing - masing diagonal nya adalah?

Luas = 1/2 x d1 x d2
90 = 1/2 x 4x x 5x
90= 2x . 5x
90= 10x
x = 90/10
x= 9

diagonal 1 = 4x = 4 x 9 = 36cm
diagonal 2= 5x = 5 x 9 = 45 cm

maaf klo salah

luas = 1/2 × diagonal 1 × diagonal 2
90 = 1/2 × 4n × 5n
90 = 1/2 × 20n^2
90 = 10n^2
n^2= 90 ÷ 10
n^2 = 9
n = akar kuadrat dari 9
n = 3

diagonal 1 = 4n = 4(3) = 12 cm
diagonal 2 = 5n = 5(3) = 15 cm

catatan: ^2 artinya pangkat dua