Question

Plis bantu yaaaa... kalo bisa semua nomor. aku gamasuk sebulan jg gangerti *sesicurhat*

Answer 1

4.
k = 2(p+l)
80 = 2( 7y + 3y )
80 = 2(10y)
80 = 20y
y = 80/20 = 4 cm
berarti
p = 7y = 7x4 = 28
l = 3y = 3x4 = 12
luasnya =
p x l
= 28 x 12
= 336