tolong pake cara kaka??

22.
[tex] \frac{1}{2} \times \pi \times r2 \\ \\ \frac{1}{2} \times 3.14 \times 400 \\ \\ 628[/tex]
no
23.=luas bangun persegi panjang
l=pxl
=14x20=280

=luas bangun 1/2 lingkaran
r=1/2 x d
=1/2 x 14
=7

=1/2 x pi x r kuadrat
=1/2 x22/7 x 49(7x7)
=1/2 x154
=77
=luas persegi panjang+luas 1/2 lingkaran
=280+77
=357

no. 27
[tex]v = \pi \times r ^{2} \times t \\ \: \: = 3.14 \times 10 ^{2} \times 32 \\ \: \: \: = 314.00 \times 32 \\ \: \: \: = 10.048[/tex]