Answer:
168
Step-by-step explanation:
Surface area= 2(WL+HL+HW)
2×(4×6+6×6+6×4)
=168
Answer:

Step-by-step explanation:
Area of rectangle

Area of circle (semi-circle+semi-circle)


Add both areas


Given

Required :

The formula for the circumference of a circle:

When we substitute and simplify: