Given:

r, s, t are midpoints of , , and .

if the perimeter (distance around) of abc is 20, then the perimeter of rst is

Step-by-step explanation:

Given that are mid points of the sides of the triangle

Perimeter of

In the 

from these two triangles are similar

Hence

Similarly

step-by-step explanation:

there is a formula i can give you:

it is r^2*n*sin(360/n) divided by 2 where r represents the "radius" and n is the number of sides.

plug them in:

(10sqrt(3))^2*6*sin(360/6) divided by 2

100*3*6*sin(60) divided by 2

900*sin(60)

900*sqrt(3)/2

450*sqrt(3)

approx is 779.4 cm^2

add an image, and i will answer

step-by-step explanation: