Luas permukaan bangun tersebut adalah…cm2
a.4.928
b.4.932
c.4.946
d.4.952
Luas permukaan :
Lp = 2 × π × r × ( r + t )
Lp = 2 × 22/7 × 14 cm × ( 14 cm + 42 cm )
Lp = 2 × 22/7 × 14 cm × 56 cm
Lp = 2 × 22/7 × 784 cm
Lp = 2 × 17.248cm/7
Lp = 2 × 2.464 cm
Lp = 4.928 cm²