Jawaban:

Koordinat titik (x,y) perhatikan titik terhadap masing2 sumbu:

x sumbu datar/horizontal

y sumbu tegak/vertikal

P(1,2)

Q(4,2)

R(7,6)

T(4,6)

S(1,6)

________________________

luas PQRS (trapesium siku-siku)

jarak PQ = 3 satuan/kotak

jarak RS = 6 satuan

jarak PS = 4 satuan

= (a + b) x t/2

= (PQ + RS) x PS/2

= (3 + 6)×4/2

= 9 x 2

= 16 satuan

________________________

RS = PT

PT = akar PS^2 + ST^2

= akar 4^2 + 3^2

= akar 16 + 9

= akar 25

= 5

(^ artinya pangkat)

keliling PQRS = PQ + QR + RS + SP

= 3 + 5 + 6 + 4

= 18 satuan

_______________

Trapesium siku-siku