Geometry. A triangle has sides 3x + 7, 4x - 9, and 5x + 6. Find the expression that represents its perimeter.
2007-01-04 06:46:25 · 8 answers · asked by Anonymous in Science & Mathematics ➔ Mathematics
you add the 3 sides to get the perimeter... so add the 3 sides:
3x + 7 + 4x - 9 + 5x + 6
12x + 4
2007-01-04 06:51:02 · answer #1 · answered by Curious Blair 3 · 0⤊ 0⤋
The perimeter is the sum of all three sides.
The sides are 3x+7, 4x-9, and 5x+6.
So, considering p as the perimeter,:
P=3x+7+(4x-9)+5x+6
P=3x+4x+5x+7+6-9
P=12x+4...
2007-01-04 07:04:27 · answer #2 · answered by abcd 2 · 0⤊ 0⤋
Just add them all together.
So:
3x+7 + 4x-9 + 5x+6 = 12x + 4
2007-01-04 06:49:31 · answer #3 · answered by E 5 · 0⤊ 0⤋
Well perimeter is like if you put a string around the figure, how big would that string be? To figure it out you just add the sides together.
3x + 7 + 4x - 9 + 5x + 6
Now just combine your like terms.
12x + 4
Hope that helps!
2007-01-04 06:49:37 · answer #4 · answered by teekshi33 4 · 1⤊ 0⤋
(3x + 7) (4x - 9) (5x +6) are the length of the sides
add together (3x +7) + (4x - 9) + (5x + 6)
(3x + 4x +5x) + (7 - 9 + 6)
12 x + 4 (answer)
2007-01-04 07:33:18 · answer #5 · answered by David C 2 · 0⤊ 0⤋
The perimeter is the sum of the sides, or 12x+4
2007-01-04 06:49:26 · answer #6 · answered by bfleung18 2 · 0⤊ 0⤋
Just add them.
12x+4
2007-01-04 07:18:50 · answer #7 · answered by Anonymous · 0⤊ 0⤋
plus two width at the top
point at the bottom
vertical
2007-01-04 06:49:49 · answer #8 · answered by Anonymous · 0⤊ 1⤋