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persegi panjang
p×l = 35×24 = 840
lingkaran
π×r² = 3,14×12×12 = 452,16 ÷ 2 = 226,08
lingkaran
π×r² = 3,14×17,5×17,5 = 961,625 ÷ 2 = 480,8125
= 840+226,08= 1066,08 - 480,8125= 585,2675
3. Mencari luas
lingkaran (yg kecil)
π×r² = 3,14×10,5×10,5 = 346,185÷2=173,0925
persegi panjang
p×l = 45×18 = 810
lingkaran (yg besar)
π×r² = 3,14×22,5×22,5=1589,625 ÷2=794,8125
= 173,0925+810+794,8125
= 1777,905
4. Mencari luas
segi tiga
½×a×t
½×35×35
½×1225
612,5
lingkaran
π×r²
3,14×17,5×17,5
3,14×306,25
961,625 ÷ 2 = 480,8125
612,5 - 480,8125 = 131,6875