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r = d/2 = 28/2 = 14 cm L. lingkaran : pi * r * r
4 L. 1/4 lingkaran = 4 * 1/4 * 22/7 * 14 * 14 = 616 cm'2
L. bangun datar = 784+616 = 1.400 cm'2
8. L. pp1 : p * l = 15*47 = 705 cm'2
L. pp2 = 45 * 35 = 1.575 cm'2
L. bangun datar = 705+1.575 = 2.280 cm'2
9. L.p = 26'2 = 676 cm'2
t. segitiga = 42-26 = 16 cm a. segitiga = 9+26+9 = 44 cm
L. segitiga : 1/2*a*t = 1/2 * 44 * 16 = 352 cm'2
L. bangun datar = 676+352 = 1.028 cm'2
20. L. pp = 65*10 = 650 cm'2
a. segitiga = 65-16 = 49 cm
L. segitiga = 1/2 * 49 * 34 = 833 cm'2
L. bangun datar = 650+883 = 1.483 cm'2