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luas setengah lingkaran= 1/4x 3,14x 400=314 m2 : 2= 157 (karena 1/2 lingkrn)
luas segitiga =1/2alas(20) x 8
=10x8= 80
400-157-80=163 m2
2.luaslingkaran= 1/4x22/7x784=616 cm2
luas layang layang= 1/2 x28x14= 196
616-196 =420 cm2.
Semoga bermanfaat, teliti lagi ya