Answer:
13.8
Step-by-step explanation:
the required constant can be calculated as:

according to the formula above:

Question 9 answer is 80 and for 10 it is 72 and for 11 it is 112 and for 12 it is 143
You have to multiple 6 times itself to get the sides
Answer: b) 160 c) 1500
Step-by-step explanation: b) 50 + 50 + 30 + 30 = 160 c) 50 x 30 = 1500