The perimeter of triangle ABC is 24 units
Step-by-step explanation:
If a segment joining the mid points of two sides of a triangle, then 
this segment is:
- Parallel to the third side
 - Its length is half the length of the third side
 
In The triangle XYZ
∵ A is the mid point of XY
∵ B is the mid point of YZ
∴ AB = 
 XZ
∵ XZ = 18 units
- Substitute the value of XZ in AB
∴ AB = 
 × 18 = 9 units
∵ B is the mid point of YZ
∵ C is the mid point of XZ
∴ BC = 
 XY
∵ AY = 7 units
∵ AY = 
 XY
∴ XY = 2 × AY
∴ XY = 2 × 7
∴ XY = 14 units
∴ BC = 
 × 14 = 7 units
∵ A is the mid point of XY
∵ C is the mid point of XZ
∴ AC = 
 YZ
∵ BZ = 8 units
∵ BZ = 
 YZ
∴ YZ = 2 × BZ
∴ YZ = 2 × 8
∴ YZ = 16 units
∴ AC = 
 × 16 = 8 units
∵ The perimeter of a triangle = the sum of the lengths of its sides
∴ Perimeter Δ ABC = AB + BC + AC
∴ Perimeter Δ ABC = 9 + 7 + 8 = 24 units
The perimeter of triangle ABC is 24 units
Learn more:
You can learn more about triangles in brainly.com/question/5924921
#LearnwithBrainly
 
        
             
        
        
        
Answer:
15
Step-by-step explanation:
 
        
             
        
        
        
Answer:
A= 14 B=17 C=20 D=26
Step-by-step explanation:
Not 100% sure this is what you needed but this is my try.
 
        
             
        
        
        
The easiest way is to use (& to memorize) the sum formula for a AP:
Sum = 1st term added to the last term & multiplied by half the number of terms
S = (a+l)n/2
S = (5 + 53)(7/2) = 203