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=1/2×15cm×25cm
=187.5cm
3).L=1/2×d×d
=1/2×24 cm×29 cm
=348 cm
4).L=1/2×(s+s)×t
=1/2×(11cm+15cm)×13cm
=103cm
5).luas persegi panjang = p×l
=39 cm×17 cm=663
luas segi tiga. = 1/2×a×t
= 1/2×13cm×12 cm=78 cm
=663cm+78cm=741cm
6).π×r²=22/7 × 24.5×24.5=1886.5cm
7).1/2×a×t×t= 1/2×16cm×12cm×12cm= 1152 cm
9).v=π×r²×t=3.14×80×80×30=602880cm
10).v=π×r²×t=22/7×14×14×30=18480cm