Question

Jawablah no 39 ini dengan benar




Mkasih

Answer 1

T kerucut = 15 cm
r = t tabung = 7 cm

A.
V gabungan = (1/3 π r² t) + (π r² r) + (2/3 π r³)
= 1/3 π r² t + π r³ + 2/3 π r³
= (1/3 × 22/7 × 7² × 15) + (22/7 × 7³) + (2/3 × 22/7 × 7³)
= (22 × 7 × 5) + (22 × 49) + (44 × 49/3)
= 770 + 1078 + 718,66
= 2566,66 cm³

B.
s² = r² + t²
s² = 7² + 15²
s² = 49 + 225
s = √274
s = 16,55 cm

L P gabungan = π r s + 2 π r t + 2 π r²
= (22/7 × 7 × 16,55) + (2 × 22/7 × 7 × 7) + (2 × 22/7 × 7 × 7)
= 364,1 + 308 + 308
= 980,1 cm²