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5x= 40
x= 40/5=8
No 11
11) L = pi x r x r .
452,16=3,14xr^2 .
r^2= 452,16/3,14=144 .
r = akar 144 = 12 .
d= 12+12=24cm
12) Lpersegi panjang = pxl = 12x9=108cm.
L lingkaran = pi x r xr .
r= 15/2=7,5 . 3,14x7,5x7,5= 176,625.
luas yg di arsir = 176,625-108=68,625(c)
13) 13) 45'/105' x 87,5 = 37,5
14) mungkin 43' karena COD= 94' berarti AOD= 86' karena siku siku jadi AOD + COD = 180' Lalu karena ABD Se busur jadi 1/2 AOD=86/2=43'
Mohon maaf apabila ada kesalahan