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=3,14x5(5+16)
=15,7x21
=329,7
b). r²=s²-t²
=20²-12²
=400-144
=256
r =√256
r=16
lpk=πr(r+s)
=3,14x16(16+20)
=50,24x36
=1808,64
c).s²=r²+t²
=10²+24²
= 100+576
=676
s=√676
s=26
lpk = πr(r+s)
=3,14x10(10+26)
=31,4x36
=1130,4
d). s²=r²+t²
=14²+48²
=196+2304
=2500
s =√2500
s=50
lpk=πr(r+s)
=3,14x14(14+50)
=43,96x64
=2813,44