How do I fine the perimeter of these triangles?

constant of proportionality => COP

3: P(triangle ABC) = 84

COP = 18/15 = 1.2

Since you are finding the larger triangle, multiply the other numbers by 1.2

25 * 1.2 = 30

28 * 1.2 = 33.6

17 * 1.2 = 20.4

add them all up (answer up top)

5: P(triangle ABC) = 61.2

COP = 9/5 = 1.8

Since you are finding the larger triangle, multiply the other numbers by 1.8

9 * 1.8 = 16.2

13 * 1.8 = 23.4

12 * 1.8 = 21.6

add them all up (answer up top)

6: P(triangle RST) = 110

RP and PT are congruent, this means that PT is also 20

COP = 40/20 = 2

Since you are finding the larger triangle, multiply the other numbers by 2

25 * 2 = 50

20 * 2 = 40

10 * 2 = 20

add them all up (answer up top)

10000

step-by-step explanation: divide by 2,

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