gmana cara mencari luas daerah berbayang?di luas gabungan bagun datar,,,itu luas 1/2 lingkaran + luas 1/2 belah ketupat..rumusnya jga

r = 14 : 2 = 7 dm

L 1/2 lingkaran = 1/2 × π × r × r
= 1/2 × 22/7 × 7 × 7 dm²
= 77 dm²

L ∆ = 1/2 × a × t
= 1/2 × 14 × 4 dm²
= 28 dm²

L berbayang = 77 dm² + 28 dm²
= 105 dm²