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L = 1/2 . t . ( a + b )
= 1/2 . 5 . ( 3 + 7 )
= 2,5 . 10
= 25 cm2 ( D )
#25
L Trapesium :
=> 1/2 . t . ( a + b )
= 1/2 . 8 . ( 9 + 12 )
= 4 . 21
= 84 cm2
L kotak yang tidak diarsir :
=> 4 . 4
= 16 cm2
Luas kotak yang diarsir :
=> 84 - 16
= 68 cm2 ( A )
#26
L = π r^2 . 1/4
= 3,14 . 10 . 10 . 1/4
= 314 . 1/4
= 78,5 cm2 ( B )