Which of these side lengths could form a triangle a) 2 cm , 2 cm , 4 cm b) 3 cm , 5 cm , 10 cm c) 3 cm , 4 cm , 5 cm d) 4 cm , 8 cm , 15 cm

C) 3 cm , 4 cm , 5 cm

Step-by-step explanation:

Using process of elimination and Pythagora's Theorem, find which of the smaller sides, when their squares are found equal to the largest number squared.

A, B, & D are wrong because:

A: 4 + 4 ≠ 16

B: 9 + 25 ≠ 100

D: 16 + 64 ≠ 225

BUT CON THE OTHER HAND 9 + 16 = 25

56.6

step-by-step explanation:

the ratio of the perimeters is equal to the scale.

the ratio of the areas is equal to the square of the scale.

34 / 20 = k

a / 19.6 = k²

substituting:

a / 19.6 = (34 / 20)²

a = 19.6 (34 / 20)²

a ≈ 56.6