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cari luas total bangun itu
L persegi = s²
L persegi = 20² = 400 dm²
cari yang tak berbayang
terdiri atas 2 bangun segitiga sama kaki, maka
2 x 10 x 10 x 1/2
2 x 100 x 1/2
2 x 50
=100 dm²
maka luas yg berbayang
luas total - luas 2 segitiga
400 dm² - 100 dm² = 300 dm²
= 20 x 20
= 400
L 2 segitiga = 2 x
= 2 x
= 2 x 50
= 100
L daerah yg berbayang = L persegi - L 2 segitiga
= 400 - 100
= 300