panjang diagonal-diagonal suatu belah ketupat adalah 10cm dan [x+4]cm jika luas belah ketupat tersebut 35cm hitunglah= A.nilai x B.panjang diagonal ke2

BANGUN DATAR

<= BELAH KETUPAT =>

L = 35
1/2 × d1 × d2= 35
1/2 × 10 × (x + 4) = 35
5(x + 4) = 35
x + 4 = 35/5
x + 4 = 7
x = 7 - 4
x = 3

diagonal duanya
x + 4 = 3 + 4 = 7 cm

d1 = 10 cm
d2 = (x + 4) cm

L. belah ketupat = 35 cm
1/2 x d1 x d2 = 35
1/2 (10) (x + 4) = 35
5 (x + 4) = 35
5x + 20 = 35
5x = 35 - 20
5x = 15
x = 15/5
x = 3 cm

Diagonal ke 2
= x + 4
= 3 + 4
= 7 cm