The perimeter of equilateral triangle TRY is 9y+45 and TY = 2y+25 . find the perimeter of triagle TRY.

The perimeter of a parallelogram ABCD is 66 cm, and DC is twice as long as BC . how long is AB ?

2 QUESTIONS .. ANSWERS PLEASE TELL ME WHAT TO DO

Obviously the sides must be equal, so

9y + 45 = 2y + 25
Solve for y, sub back into the expression for the side to get its length.

2nd:
let the short side be x
then the longer side is 2x

solve:

x + x + 2x + 2x = 66

is number 1. = 7y=20 ? ?? i don't know help me on math please/

no

9y + 45 = 2y + 25
7y = -20
y = -20/7

so each side is 2y+25 = 2(-20/7) + 25
= 135/7

perimeter = 3(135/7) = 405/7 or appr 57.86

To find the perimeter of triangle TRY, you need to know the lengths of all three sides. We are given that TY = 2y + 25, but we don't have the lengths of the other two sides.

However, we can use an important property of an equilateral triangle: all three sides are equal in length. Let's assume that all sides are equal to x.

Since TY represents one side, we know that TY = x, which we can also express as x = 2y + 25.

Now, we can find the perimeter by adding up the lengths of all three sides: Perimeter = x + x + x = 3x.

Substituting x with 2y + 25, we get Perimeter = 3(2y + 25) = 6y + 75.

Therefore, the perimeter of triangle TRY is 6y + 75.

Now, let's move on to the second question about the parallelogram ABCD.

We are given that the perimeter of the parallelogram is 66 cm, and DC is twice as long as BC. Let's assume that the length of BC is x, which means that the length of DC is 2x.

The perimeter of the parallelogram is the sum of all four sides: Perimeter = AB + BC + CD + DA.

Since it is mentioned that AB is one of the sides and DC is opposite to AB, they must have the same length. Therefore, AB = DC = 2x.

The perimeter equation can then be rewritten as: 66 = 2x + x + 2x + DA.

Simplifying the equation, we get: 66 = 5x + DA.

To find the length of AB, we need to determine the value of DA. Unfortunately, the given information does not provide it, so we cannot find the exact length of AB. However, we can find a relationship between AB and DC based on the information provided.

Since DC is twice as long as BC, we have: DC = 2(BC).

Substituting the values with AB and DC, we get: AB = 2(AB).

This shows that AB is equal to half the perimeter of the parallelogram. Therefore, AB = 66/2 = 33 cm.

Thus, the length of AB is 33 cm.