tent. a.nilai x b.panjang DE c.keliling jajargenjang CDEF d.luas jajargenjang CDEF

Jajargenjang : sisi yg berhadapan sama panjang

a. nilai x
4x + 8 = 40
4x = 40-8
4x = 32
x = 32/4
x = 8

b. Panjang DE
DE = 24

d. Keliling
2(p+l)
= 2(40+24)
= 2(64)
= 128 cm