Question

7. B) please! i’m not sure i quite understand how to do it

Answer 1

3cm

Explanation:

those double hashes on those 5 sides mean they are equal. so essentially you have 5 sides that measure 3/10cm and one side that measures 1 1/2cm.

3/10 * 5 = 15/10 = 1 1/2cm

1 1/2cm + 1 1/2cm = 3cm