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La=1,386cm
T=28cm
π=22/7
ditanya Lp..??
La=π×r²
1.386=22/7×r²
1.386×7=22r²
r²=9702/22
r²=441
r=√441
r=21cm
s=√r²+t²
=√21²+28²
=√441+784
=√1225
s=35cm
Lp=π×r(r+s)
=22/7×21(21+35)
=66×56
=3.696cm²