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b. mencari setengah diagonal satunya= √15² - 12²=√225-144 =√81= 9cm
satu diagonal utuh = 2 x 9 = 18 cm
luas = 1/2 x 24 x18 = 24 x 9 = 216 cm²
L = (a+b) x t x 1/2
320 = (23+17) x t x 1/2
320 = 40 x t x 1/2
320 = 20t
16 cm = t