Tolong dibantuin dong. Nomor 19.

p = 26 cm
r2 = 18 cm
r1 = 8 cm

BE = DC
Perh segitiga BEA
BE = akar dari 26^2 -10^2
BE = 24 cm
DC=BE=24 cm

L = (18+8)×24 / 2
L = 26×12
L = 312 cm^2
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