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kalau persegi panjang nya
L persegipanjang=20 x 17=340 cm2
maaf y kalau aq slh.coba di cek lg
= √ 289 - 225
= √ 68
= 8cm
Luas alas = 1/2 x a x t
= 1/2 x 8 x 15
= 60cm²
Keliling = a + b + c
= 8 + 15 + 17
= 40cm
Lp = Keliling x tinggi + 2 x L.alas
= 40 x 20 + 2 x 60
= 800 + 120
= 920cm²
Jawaban ( C )