Tolong kerjakan Nomer 4

Luas = 1/2.d1.d2
= 1/2 . 30 . 40
= 600 cm persegi
Keliling :
Cari garis tepi pakai pythagoras
s = 15^2 + 20^2
= 225 + 400
=√625
= 25 cm
Keliling = 4s
= 4(25)
= 100 cm

1/2×d1×d2
1/2×20×15
=1/2×300
=150