HELPPP

Determine whether a triangle with the given side lengths is a right triangle

1. right angle

2. not a right angle (acute)

3. not a right angle (acute)

4. right angle

Step-by-step explanation:

if all three numbers add up to 90 then it's a right angle, anything below 90 is an acute angle and anything above 90 is an obtuse angle

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