tentukan luas tembereng lingkaran dia atas (o=3,5 cm

Bab Lingkaran
Matematika SMP kelas VIII

karena 90°
tembereng = 2/7 x r²
tembereng = 2/7 x 3,5 x 3,5
tembereng = 3,5 cm²

L. Lingkaran
= ∏ × r × r.
= 22/7 × 3,5 × 3,5.
= 22/7 × 12,25.
= 38,5cm⁲.

L. Juring = 1/4 Lingkaran.
L. Juring = 1/4 × 38,5.
L. Juring = 9,625cm⁲.

L. Segitiga
= 1/2 × a × t.
= 1/2 × 3,5 × 3,5.
= 1/2 × 12,25.
= 6,125cm⁲.

L. Tembereng
= 9,625 - 6,125.
= 3,5cm⁲.