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= 20 ×20
400
luas lingkaran = phi × r kuadrat
= 3,14 × 10 ×10
=314
(karena 1/4 lingkaranya ada 4 maka di anggap jdi 1 lingkaran)
=luas segiempat - luas lingkaran
= 400-316
=86
[maaf klo salah]