Perhatikan gambar berikut! Luas bagian yg diarsir adalah
aliftariyan
L yang diarsir = L trapesium - L 1/4 lingkaran = (1/2 x (a+b) x t) - (1/4 x πr²) = (1/2 x (30+20) x (20+5)) - ( 1/4 x 3,14 x 20 x 20) = (1/2 x 50 x 25) - ( 3,14 x 5 x 20) = 625-314 = 311 cm²
= (1/2 x (a+b) x t) - (1/4 x πr²)
= (1/2 x (30+20) x (20+5)) - ( 1/4 x 3,14 x 20 x 20)
= (1/2 x 50 x 25) - ( 3,14 x 5 x 20)
= 625-314
= 311 cm²
= (20+30) × 25/2 - 1/4 × (3.14 × 20^2)
= 50 × 25/2 - 1/4 × (3.14 ×400)
= 1250/2 - 1/4 × 1256
= 625 - 314
= 311 cm^2
semoga berguna