Friday

September 19, 2014

September 19, 2014

Posted by **Joy** on Wednesday, March 5, 2008 at 10:35pm.

a) If the perimeter of the copy is 36 meters, find the perimeter of the original triangle using the proportion 10/3.

b) If the area of the copied triangle is 48 meters squared, use a proportion to find the area of the original triangle.

Please HELP me! I don't really know how I can solve this...

- Pre-Algebra -
**Samantha**, Thursday, March 6, 2008 at 1:10am( copy/ orginal) = 10/3

(10/3)=(copy perimeter)/(orig.perimeter)

(10/3)=(36/X)

cross multiply and you get

10x=108 then x= 10 4/5 =10.8

x=perimeter of org.

triangle

Do the same with part b but this time it's area.

(10/3)=(48/x) ===> x= 14 2/5 =14.4

- Pre-Algebra(second part is wrong) -
**Reiny**, Thursday, March 6, 2008 at 7:54amSamantha, your second part is not correct

The area of similar figures is proportional to the**square**of their sides. Since perimeter is a function of the sides you last line should have been

(10/3)^{2}=(48/x) ===> x= 4.32

- Pre-Algebra(second part is wrong) -

**Answer this Question**

**Related Questions**

Pre-Algebra - Two similar triangles have a scale factor of 5/3. a) Find the ...

Math - I have two similar triangles. The perimeter of the smaller triangle is 20...

Algebra 2 - Perimeter of Triangle: the length of the sides of a triangle are 1/x...

math - The scale factor for two similar triangles is 4 : 3. The perimeter of the...

math - The scale factor for two similar triangles is 4 : 3. The perimeter of the...

geometry - The scale factor for two similar triangles is 4 : 3. The perimeter of...

Geometry - The scale factor for two similar triangles is 4 : 3. The perimeter of...

Perimeter of a triangle - Perimeter of a triangle. The perimeter of the triangle...

algebra, HELP! - 9. The sides of a rectangle are increased by a scale factor of ...

Math - The side of a square is 10 meters longer than the side of an equilateral ...