P = 70 l = 100 keliling bangun datar tersebut adalah

(Px2)+(lx2)
=(70×2)+(100×2)
=140+200
=340

K = 2(p+l)
= 2(70+100)
= 340

Kseluruh bangun = 340 – (1/2xπxd)
= 340 – (1/2×22/7×70)
= 340 – 110
= 230