Question

Tlong jawab pke jalan ya

Answer 1

1.
luas permukaan kerucut = 2*phi*r (r+t)
= 2 * 22/7 * 3.5 (3.5+11.5)
= 22 (3.5+11.5)
= 330

2.
luas selimut tabung = 2*phi*r*t
= 1650= 2 * 227/ * r *25
= 1650 = 1100/7 * r
r = 1650 : 1100/7
= 1650 * 7/1100
= 10.5

3.
volume = phi * r * r * t 
= 22/7 * 2.8 * 2.8 * 8
= 197.12

5.
luas permukaan  = 2*phi*r (r+t)
880 = 2*22/7*7 (7+t)
880 = 44 (7+t)
7+t = 880 : 44
7+t = 20
t = 20-7 = 13

6.
volume = phi * r * r *t
= 22/7 * 7 * 7 * 14
= 154 * 14 
= 2156

7.
luas selimut tabung = 2 * phi * r * t
= 1540 = 2 * 22/7 * 7 * t
=1540 = 44 * t
t = 1540 : 49
=35
volume = phi * r * r * t * 
= 22/7 * 7 * 7 * 35
= 154 * 35 
 = 5390