Ingat rumus pythagoras ya adik-adik :
s = √r² + t²
s = √21² + 18²
s = √441 + 324
s = √765 = 27,658 (dibulatkan jadi 28)
atau √9 x 85 = 3 √85
Luas Selimut kerucut = π x r x s
= 22/7 x 21 x 28
= 22 x 3 x 38
Ingat rumus pythagoras ya adik-adik :
s = √r² + t²
s = √21² + 18²
s = √441 + 324
s = √765 = 27,658 (dibulatkan jadi 28)
atau √9 x 85 = 3 √85
Luas Selimut kerucut = π x r x s
= 22/7 x 21 x 28
= 22 x 3 x 38
Editor: Muhammad Khusaini
Sumber: buku.kemdikbud.go.id