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b) y+70 = 180
y = 180-70
y = 110˚
c) sisa dr selisih p.sisi sejajar = (23-17):2 = 6:2 = 3 cm
t = akar dr 4²+3²
= akar dr 16+9
= √25
= 5 cm
jadi, L = 1/2.jumlah sisi sjajar.t
= 1/2.(17+23).5
= 1/2.40.5
= 100 cm²