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Jawaban Terkonfirmasi
T² = 25² – [(28 – 14)/2]²
t² = 25² – 7²
t² = 625 – 49
t² = 576
t = √576
t = 24
L trapesium = 1/2 × (a + b) × t
= 1/2 × (14 + 28) × 24 cm²
= 42 × 12 cm²
= 504 cm²
L 1/2 lingkaran = 1/2 × π × r²
= 1/2 × 22/7 × 7 × 7 cm²
= 77 cm²
Luas diarsir = 504 cm² – 77 cm²
= 427 cm²
T trapesium
= ½(28-14)=½.14= 7
t trapesium =√25²-7²=√625-49=√576=24 cm
L daerah yang diarsir =
L trapesium – L ½ lingkaran =
(½×(a+b)×t) – (½×phi×r²)=
(½×(14+28)×24)-(½×22/7×7×7)=
(½×42×24)-(11×7)=
(42×12)-77=
504-77=
427 cm²