Question

Pada trapesium PQRS, PQ // SR. PQ = 3x cm, SR = 2x cm dan luas daerah trapesium 100 cm. berapa panjang PQ dan SR jika tinggi trapesium 8 cm.?

pake cara!

Answer 1

L = (a + b) x t x 1/2
100 = (3x + 2x) x 8 x 1/2
100 = 5x  x  4
100 : 4 = 5x
25 = 5x
25  : 5 = x
5 = x

maka
PQ = 3x = 3  x  5 = 15 cm
SR = 2x = 2  x  5 = 10 cm

Answer 2

100 = (3x+2x) . 8
                   2
200 = 5x.8
200/8 = 5x
25  = 5x
x = 25/5
   = 5
PQ = 3x = 3.5 = 15 cm