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81 = 1/2. 18(2x+3)
9 = 2x + 3
6 = 2x
x = 3
b) diagonal kedua = 2x+3 = 6+3 = 9
no 1 dlm proses
belah ketupat
a) koordinat titik D ( -1, 3)
b) keliling = 4 s = 4 x 5 = 20
luas = 1/2 d1 d2 = 1/2x 8 x 6 = 24
trapesium
a) CD/AB = 2/5
sudut D = sudut C = 90+30=120
sudut A= B = 60
b)
luas = 80 = 1/2( AB)(CD)
80 = 1/2 AB 2/5 AB
AB² = 400
AB = 20 maka CD = 2/5 . 20 = 8
c) keliling = 8+20+ 10 + 10 = 48
rumus luas layang2
L =1/2 d1. d2
tinggal masukin angka2 nya kamu pasti bisa sendiri