Jawabanmu

2014-01-14T23:43:23+07:00
2(PQ + QR) = 58
PQ + QR = 29
3x + 5 + x + 8 = 29
4x = 16
x = 4 cm
1 5 1
2014-01-14T23:45:08+07:00
Keliling = 58cm
Keliling = 2 alas + 2 sisi miring
58cm = 2 ( 3x +5) + 2 (x +8 )
58 cm = 6x + 10 + 2x + 16
58 cm = 8x + 16
58 - 26 = 8x
32 = 8x
32 : 8 = 4
kalo x nya 4
berarti kelilingnya 184 bukan 58
Jika X = 4 ; Maka keliling 2 (12 + 5 ) + 2 ( 4+8 )
betul kok x=4