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= 44+44=88cm2
2b. ××28 + 26×4
44+104=148 cm2
3a.14×3+××14
=42+22=64cm2
3b. 3,14×10 +5×4
31,4+20=51,4cm2
a.) keliling lingkaran besar = 22/7 x 28 =88
keliling lingkaran kecil = 22/7 x 14 = 44
= 88 + 44 = 132
keliling lingkaran tanpa diarsir = 22/7 x 14 = 44
=132 - 44 = 88
b.) keliling persegi = 40 x 4 = 160
keliling 1/2 lingkaran = 22/7 x 28 x1/2 = 44
= 160 - 44 = 116
3.)
a.) keliling persegi = 14 x 4 = 56
luas persegi = 14 x 14 = 196
keliling 1/2 lingkaran = 1/2 x 22/7 x 14 =22
luas setengah lingkaran = 1/2 x 22/7 x 7 x 7 = 77
keliling seluruhnya = 56 + 22 = 78
luas seluruhnya = 196 + 77 = 273
maaf kalau salah