Jawabanmu

2014-09-09T20:59:08+07:00
A = 25
t= 10

L = a x t /2 
L = 25 x 10/2
L = 25 x 5
L = 125 cm²

Semoga dapat terbantu :)
2014-09-09T21:03:11+07:00
Langsung pake rumus segitiga: 1/2 x 25 x 10
1/2 x 250
125 cm2