no 25 luas gabungan tersebut adalah.......cm

L= L. Trapesium + L. Jajar genjang
= ( 1/2 x (a + b) x t ) + ( a x t )
= ( 1/2 x (17 + 25) x 10 ) + ( 17 x 12 )
= ( 1/2 x 42 x 10 ) + ( 204 )
= 210 + 204
= 414 cm2