Maths question.... I’m really bad at maths

Step-by-step explanation:
Cylinder's Total Surface area = 3πr²
Here r=10 cm
3π10²
300π
Hope this helps you.
Answer:
200π
Step-by-step explanation:
4(10)²π ÷ 2 since it is only half a sphere
400π ÷ 2 = 200π