Jawabanmu

2014-06-04T23:50:13+07:00
Pythagoras=
a = √b² + c²
a = √20² + 48²
a = √400 + 2304
a = √2704
a = 52
luas permukaan segitiga =
1/2 ( a x t )
= 1/2 20 * 48
= 480 * 2
= 960
luas permukaan persegi panjang =
p*l
= 71 * 20
= 1420
p*l
= 71 * 48
=3408
p*l
= 71 * 52
= 3692
jumlah seluruh luas permukaan
= 960 +1420+3408+3692
= 9480