tolong nomor 11 nya klo bisa 12 dan 13 juga

11.
panjang SR
SR*2 = 12*2 + 16*2
SR*2 = 144 + 256
SR*2 = 400
SR = √400
SR = 20

Keliling = semua sisi ditambah
= 16+16+16+12+20
= 80 cm
Jawaban = c.80 cm

12.
Tinggi = 4cm
Misal
panjang sisi miring = x
x*2 = 3*2 + 4*2
x*2 = 9 + 16
x*2 = 25
x = √25
x = 5

Keliling taman = 10+16+5+5
= 36cm

13.
Keliling belah ketupat = 4sisi
80 = 4sisi
80/4 = sisi
20 = sisi

misal
x = 1/2 diagonal yg lain

x*2 = 20*2 - 16*2
x*2 = 400-256
x*2 = 144
x = √144
x = 12cm

Diagonal lainnya = 2x
= 2.12
= 24cm
Luas = 1/2 24x32
= 384cm*2
Jawaban = c.384cm*2