PLZ HELP

First drop down is 90 or 180

second drop down is:
1 and 2
1 and 4
2 and 3
3 and 4

third drop down is 1 or 4

First drop down is 180°, second drop down is 1 and 4, third drop down is 1.

Solution:

Data in the given image:

2, 3 and 4 are interior angles of the triangle.

1 is the exterior angle of the triangle.

Triangle sum property:

Sum of the interior angles of the triangle are supplementary.

By the triangle sum property,

The sum of the measures of angles 2, 3 and 4 is supplementary (180°).

m∠2 + m∠3 + m∠4 = 180° – – – (1)

The sum of the measures of angles 4 and 1 is 180°.

Because they form a linear pair.

m∠1 + m∠4 = 180°  – – – (2)

Using the substitution property, equate (1) and (2).

m∠2 + m∠3 + m∠4 = m∠1 + m∠4

Then by the property of equality, subtract m∠4 on both sides, we get

m∠2 + m∠3 + m∠4 – m∠4 = m∠1 + m∠4 – m∠4

m∠2 + m∠3 = m∠1

Hence first drop down is 180°, second drop down is 1 and 4, third drop down is 1.

check the picture below.

well, the angle at the vertex d is clearly not a right-angle, let's check for the one at the vertex f which does look like,   however if it's indeed, that means ef is perpendicular to df, in which case their slopes will be negative reciprocal of each other.

so the negative reciprocal of the slope of ef is 1, however the slope of df is not 1, is 1/2, so nope, they're not perpendicular lines.

12m

step-by-step explanation:

square root means have of a number so have of 3 is 1.5 then multiply it by 8 and you get your answer!