Question

Diket : Keliling alas = 44 cm
Tinggi = 24 cm
Pi = 22/7
Berapakah selimut kerucutnya ???

Answer 1

K = 2 × π × r
44 = 2 × 22/7 × r
44 × 7 = 2 × 22 × r
308 = 44 × r
r = 308 : 44
r = 7 cm

s = √(r² + t²)
= √(7² + 24²)
= √(49 + 576)
= √625
= 25 cm

Answer 2

Kel. alas = 44 cm
22/7 x D = 44 cm
D = 44 ÷ 22/7
D = (44 x 7) ÷ 22
D = 14 cm
r = 7 cm

s (garis pelukis) = √r² + t²
= √7² + 24²
= 25 cm

Luas selimut kerucut = π r s
= 22/7 x 7 x 25
= 550 cm²