Formula: surface area = lateral area +2 base areas lateral area = base perimeter * height =3. 14* diameter * height =3. 14* radius *2* height.
3. 14×(2÷ 1)? ×2+3. 14×2×0.8
=6.28+5.024
= 1 1.304(cm？ )
2.
3. 14×0.5? ×2+3. 14×0.5×2×3.5
= 1.57+ 10.99
= 12.56(cm？ )