# triangles

posted by .

The measures of two of the sides of an equilateral triangle are 3x + 15 in. and 7x – 5 in. What is the measure of the third side in inches?

• triangles -

3x + 15 = 7x - 5

20 = 4x

5 = x

• triangles -

Ya gotta watch out for Ms. Sue; she's a sly one. Notice how she solved for x, but she left it up to to actually answer the question!

:-)

## Similar Questions

1. ### Math

A pentagon is formed by putting together three identical equilateral triangles and one larger equilateral triangle with length of edge equal to 2 times that of the smaller equilateral triangle. If the perimeter of the smaller triangle …
2. ### Calc HELP!

an equilateral triangle is one in with all three sides are length. If two vertices of an equilateral trangle (0,4) and (0,0), find the third vertex. How mant of these triangles are possible?

the lengths of two sides of a triangle are 15 inches each and the third side measures 10 inches what kind of triangle is that
4. ### Math

A store's sign is the shape of an equilateral triangle. One side measures 21 inches. What is the length of each of the other two sides?
5. ### Math

Kaity draws a scalene triangle. Two sides measure 5 inches and 3 inches?
6. ### geometry

Two sides of an equilateral triangle are 3x +15 and x + 21. Which of the following could be the measure of the third side?
7. ### math i don't get it

If 6 equilateral triangles are placed side by side so that only two sides of each triangle touch one of the other triangles, what shape is formed?
8. ### Math

If six equilateral triangles are placed side by side so that only two sides of each triangle touch one of the other triangles what shape is formed?
9. ### Algebra 2

Type the correct answer in the box. Use numerals instead of words. If necessary, use / for the fraction bar. Find the sum of a finite geometric series. The sides of an equilateral triangle measure 16 inches. The midpoints of the sides …
10. ### Math

Use the congruent triangles shown to answer question 6 and 7. 6. A. B. C. D. 7. Side BC is congruent to which side?

More Similar Questions