Answer:
A=10 cm
B=5 cm
Area of square = 25 cm
Step-by-step explanation:
Since that is an equilateral triangle based off the fact that all the sides are the same variable (a) then that means 30 divided by 3 which equals 10. So now we know that a = 10. Lets input that information for the rectangle. Since there are 2 a's that equals 20 and the perimeter is 30 so b has to be 5 since 5 times 2 is 10 plus 20 equals 30. so now we know that a=10 and b=5 so our squares sides are all 5. The area of the square is 25
Answer:

Step-by-step explanation:
Regan needs the following:
yards for a dress

Total Length of fabric needed

The number of yards of 45-in. fabric needed is 
262.5 miles
explanation 1/4 is half of 1/2 so 52.5 is half of 105 and then 210 for an hour of travel
The answer is negative, because the first number is negative.
Step-by-step explanation:
sides:91/12=42/26
angles:LMN=LBA and MNL=BAL