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= ( 1/2 × π × r² ) + ( 2 × 1/2 × π × r²)
= ( 1/2 × 22/7 × 14²) + ( 22/7 × 7² )
= ( 1/2 × 22/7 × 196 ) + ( 22/7 × 49 )
= ( 1/2 × 616cm² ) + 154cm²
= 308cm² + 154cm²
= 462cm²
12.luas berbayang= luas persegi - ( luas segitiga + luas setengah lingkaran
= ( s × s ) - ∫ ( 1/2 × a × t ) + ( 1/2 × π × r² ) ∫
= ( 20 × 20 ) - ∫ ( 1/2 × 20 × 8 ) + ( 1/2 × 3.14 × 10² ) ∫
= 400m² - ∫ ( 10 × 8 ) + ( 1/2 × 3.14 × 100 ) ∫
= 400m² - ∫ 80m² + ( 1/2 × 314cm² ) ∫
= 400m² - ∫ 80m² + 157m² ∫
= 400m² - 237m²
= 163m²
13. luas seluruhnya = ( 2 × L 1/4 lingkaran ) + ( luas layang-layang )
= ( 2 × 1/4 × π × r² ) + ( 1/2 × d1 × d2 )
= ( 1/2 × 3.14 × 10² ) + ( 1/2 × 16 × 21 )
= ( 1/2 × 3.14 × 100 ) + ( 8 × 21 )
= (1/2 × 314dm²) + 168dm²
= 157dm² + 168dm²
= 325dm²
maaf kalau salah