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b. luas lingkaran ÷4
c. luas setenganh lingkaran+luas persegi
d. luas setengah lingkaran (r=10)
3.a. diameternya
b. phi x diameter
a.
Lpersegi panjang - Llingkaran
= p×l - pi.r.r
= 28×14 - 22/7.7.7
= 392 - 154
= 238 cm^2
b.
L1/4lingkaran
= 1/4.pi.r.r
= 1/4.3,14.10.10
= 1/4.314
= 78,5 cm^2
c.
Lpersegi + L1/2lingkaran
= s×s + 1/2.pi.r.r
= 21×21 + 1/2.22/7.10,5.10,5
= 441 + 173,25
= 614,25 cm^2
d.
L1/2lingkaran
= 1/2.pi.r.r
= 1/2.3,14.10.10
= 1/2.314
= 157 cm^2