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s = ( 50 - 21 - 9 ) : 2
= 20 : 2
= 10 cm
a = ( 21-9) : 2
= 6 cm
tinggi prisma
t = √ 10² - 6²
= √ 100 - 36
= √ 64
= 8 cm
luas trapesium
L = ( 21 + 9 ) x 8 : 2
= 30 x 4
= 120 cm²
jawabnnya A
20/2 =10.
t^2=10^2-6^2
t^2=100-36
t^2=64
t=8
l trapesium =(9+21)/2x8
=30x4=120