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L2 = 2( 1/2x3x4)=12
jd luas seluruh bangunan adalah
96+12=108
7.
L 1 = 1/2 ( pr^2)
= 1/2 ( 22/7 x 7^2)
= 1/2(154)
= 77
L 2= 1/2 at
= 1/2 x 14 x 4
=28
jadi luas seluruh bangun adalah 77+ 28 = 105 dm2
8.
L1= 21x 21=441 dm2
diameter link = 21
jar jarinya = 21:2= 10,5
LO= 3,14x 10,5x10,5=346,185dm2
luas bangun yg diarsir adalah L1 - LO= 441- 346,185=94,815
mudah2 an bener ya