jika luas trapesium 224cm l=19cm t=14cm berapa panjangnya

luas = a+b×t / 2
224= 19+b×14 /2
224= 19+b×7
19+b= 224/7
19+b= 32
b= 32-19
b= 13 cm

L = 1/2 × Jumlah sisi sejajar × t
224 = 1/2 × ( p + 19 ) × 14
( p + 19 ) = 224/7
( p + 19 ) = 32
p = 32 - 19
p = 13 cm