apotema=10 tali busur=30 berepa keliling nya

Kelas 8 Matematika
Bab Lingkaran

r = √(apotema² + (1/2 . tali busur)²)
r = √(10² + (1/2 . 30)²)
r = √(100 + 225)
r = √325 
r = 5√13 cm

Keliling = 2 . r + tali busur
Keliling = 2 . 5√13 + 30
Keliling = (10 √13 + 30) cm